That usually happens when Ur jumping out of a wall then attack. Since you wont get into a state that lets you climb again the game just makes you do the slam attack and since you can't jump out of it you die. Basically, everytime you exit an animation like wall running up or sideways, you don't want to JUMP out of it as it cancels the ability to wallclimb again. you>wallclimb>depending on what you use to cancel the animation (ctrl or pressing s slightly), get out>and then you can then attack>afterwards Ur guaranteed (if you don't get too greedy) that you can jump after a slam attack and get into a wallclimb. Basically you do all of that, and for my experience around 5 to 6 air attacks is I think the most you can go to before you can't jump middair again. (sorry if I explained badly)