to stop the critics regarding the missing sync kills, here a suggestion to implement it into a more strategic way:
- make it able to toggle via the unit details
- make the units more vulnerable to damage while performing this animation
when performing this they could get some "XP" to buff the units around them in an area of effect radious, this means:
Friendlies get an increased leadership bonus (more damage e.g.) and foes get the opposite, cuz the unit performed some strikes against them, which were a "statement"
the effect just stays for a short time, so the player needs to use this ability again to gain this boost on his troups
I hope there will be no implementation like "make this unit be immune to damage for the x seconds of animation", what I could read in some Steam threads.
This is still an RTS game and not an no-brainer-gore-simulator.