Thought I would put this on to try and get some educational feedback and maybe prevent someone else from encountering a similar problem in the future. Went through Heaps with a group of 4 last weekend. 2 in the group had done Heaps 1 time prior, for me it was my first time through. I had studied up and prepared what I felt like was required for a safe passage through Heaps. Everything went smooth until the last 25-30 feet of the last rap. The leader was staying on the bird perch to sequence others through so I was the first in the group to the bottom. On the perch it was fairly windy causing the end of the rope which still had the Imlay bag attached to drift in the wind out away from the sloped ground. All 300 feet was visibly out with no knots. I have been using the Sqwurel for about the last 15 canyons and have really liked the ability to add friction on big raps mid rappel while keeping my brake hand in brake position. A hoard of tourists where gathered to welcome me with many taking pictures or video when before I realized what happened (25-30 feet from the ground) a knot caused by the rope twisting hit my brake hand. Before it went to the rappel devise I tried to pull it out and undo it but in trying this I descended the rope that foot or so and it tightened against the Sqwurel. At first I thought no big deal I will just pull this out and be done. After multiple attempts I realized this wasn't going to be that easy. I then decided I need to unweight the devise on the knot so I hooked on one (only had one with me) ascender with a sling for my foot. I stood up and tried using my left hand to keep myself upright trying to undo the knot with my right. After a number of failed attempts and a lot of expended energy I realized this was not happening. I studied the knot and found that if I could pull out one bend it should come undone. I was barely able to get a extra biner on the bend and with all the strength I had left I was able to twist and pull the bight of rope out undoing the knot. I'm about 30 minutes into this ordeal at this point still wearing a 5mm wetsuit and it is over 90 degrees out so I am dying of heat and exhaustion. To my great relief the knot pulls out but before I can celebrate I realize I am still stuck on the rope. A bight of the rope is wedged in the first tail notch. No knot at all. If I can pull the down side of the rope down it should pull it out but it is wedged in beyond imagination. I try and bounce on the rope to release it, this does nothing. The nuclear option for me at this point is to put on a back up atc I had and attach it to my harness waist loop and cut my harness belay loop and rap below the devise to the ground. I don't want to do this because I have now created a problem for the rest of the group. I have been yelling up to those on the perch but have heard nothing back. I later found out they could hear and see me through a crack but I never could hear or see them at all. During this time they were getting the other 2 down to the perch planning to use the pull side to send down ascenders and pull me up to unweight the knot if needed. They told me later had I left a knot or my sqwurel stuck on the rope the leader would have used the pull ropes (120 and 220), he was planning on lowering them 120 and then having them rap from below the rope junction knot to the bottom. He would have then set it back up as was originally intended and passed the knot/Sqwurel. I new I need to fully unwieght the rope and free up both hands to have any chance of ever getting free. I had another sling I got out and was going to make a prussic attached to my harness and try and use that in combination with the acsendor and foot loop. I finally decided to drop my heavy pack (we overnighted at the crossroads) onto the rocks so I wasn't pulling up that weight. Then the thought kept coming that if someone was able to pull me over I might be able to reach the slope before the cliff face starts. From my perspective it looked like I was to high but I was withering in the heat and already looked like a idiot in front of all these people. I decided before I would make anymore attempts of releasing the devise I would see if people could pull me over and at least get me closer to the ground and have me on firemans belay and maybe pull the bight of rope free. Three guys came around and pulled the rope over to a tree that was below me but somehow I still reached. I was able to grab the tree and one of them climbed up it a bit and I had him cut my belay loop. I had no strength in my arms at this point so they kindly offered to help and after about 5 minutes they were able to push the bight of rope though and release it from the tail notch. Everyone else then came down uneventfully. What I learned from this Don't wear a wetsuit on these raps if its hot at all. Watch the rope for twisting as you go down. I have seen ropes twist but never 30 feet from the end, in my experience it has been in the last 10-15 feet of rope and not creating a knot like that. A question I have was having the rope bag on the end have any effect on this. Be more prepared to unweight the rope mid-rappel and give it the proper effort the first attempt before I am over heating and exhausted. Any thoughts on the device being problematic in that the notches are just the right size to wedge a 8.3mm diameter twisted bight of rope into. It aint over til its over. My apologies for the poor spelling and grammar but aint nobody got time for that.