Code:

my.skill15 = max(my.skill15,-15);
		my.skill15 = min(my.skill15,0);
		
		if(key_e == 1) 
		{
			my.skill15 -= 1.0*time_step;
		}
			my.skill15 += 0.5*time_step;
		
		ent_animate(my,NULL,0,0);
		ent_bonerotate(my,"arm_axis",vector(0,my.skill15,0));


Is this what you were thinking of? It should stay at 15, unless the user presses and holds the E key. Then it will go back up (when released).

If I am posting, it probably means I am asking a question. Or faking my knowledge by agreeing with somebody else.