I am stuck on the last lv on Gun and I can't complete it, how do you do..

Okay magruder iz hiz name and he's not easy, first when he walks over the gas spots on the ground throw dynamiteor shoot it with the dyanamite bow, try to time it rite so that it explodes when hes in the middle of the gas jet, keep dooin that until he jumps up on the high ledge then start shooting him in lots and eventualy he will throw a big block of dynamite quickdraw it and it will blow up, do that about 3-5 times and eventually a big rock will fall on him and you get to enjoy a nice long cutscene. Hope this helps!!!

Firstly get as far away from him as possible, but when he starts chasing you use your dynamite arrows to set the gas of do that a few times and he will go up on a ledge, fire at his head a few times but when he throws dynamite use quickdraw to blow them up, then the cave will collapse on him!!!!!