.. and I suppose that this stopping thing is also part of the reason why AEC treadshot seems to be derping so much; nobody in their right mind would use it while moving.
I'll check it out next. Also please don't trust me completely, I might be overlooking something. But so far it seems consistent.
BTW all tests are on the 1.8 WBP
EDIT: Ok, with the AEC, the source of the problem is likely similar, but the behavior is funkier:
1. Keep it stationary and it will work, as long as there's unbroken LOS.
2. Activate while stationary, then start moving - the ability will work (assuming, of course, that the rate of turret rotation permits you to get the 2 shots off in a certain timeframe) unless you come to a full stop again - not the deceleration thingy.
3. If the AEC is already moving when the order is issued 1 of 2 things happens:
3.1 If the destination of the move is nearby, the ability fails immediately;
3.2 If the destination is further away (not sure what distance exactly), the ability works as point 2 - it's fine unless you stop completely.
In any case I get the feeling that the slow turret rotation is probably at fault for the clunkyness of the ability as much as the bugs.