Slasher can move while deployed if movement started by impulse.

[RyMarq]

http://zero-k.info/Battles/Detail/270013

The effect occurs in this game.

[xponen]

You should've mentioned that the weapon impact (from leveler) caused slasher to not go out of deploy mode and did move+shooting. (at minute 3)

But this seems to be self-limiting case. The same unit weren't able to move+attack afterward.

[GoogleFrog]

3d5f633

I managed to reproduce this with Newtons, Slasher and disabled fall damage. It was fixed within this commit with a loop that checks whether the unit has contact with the ground and sufficient speed. It looks like an engine bug, StartMoving is sometime not called if a unit hits the ground when it already has a move order. This can occur with any unit which makes them look silly.