The intrinsic mod for Merciless states that non-lethal hits progressively accelerate charge times until the target is killed. I've been using it for a couple of days now and it doesn't seem to trigger - or, at least, it doesn't for 99% of the time. There were a few occasions where it [i]did[/i], but after several matches on different game modes and against different enemies, it feels like it's chance-based at this point. I did some testing on my own, and there doesn't seem to be any influence whether [b]a)[/b] you're aiming down sights until reload, [b]b)[/b] you're firing from the hip until reload or [b]c)[/b] immediately firing from the hip after shooting once or twice whilst aiming down sights and vice-versa. I'd also like to state that I [i]have[/i] tested it against high-health enemies (such as Bosses from Pyramid encounters on Io) to make sure the reason it wasn't triggering was because the target was killed beforehand.