Enemies deployables turns against the enemy team.
Whether this ability could be implemented to an already existing merc, or introduced to a new merc entirely, is a different can of worms.
The time it would affect deployables, range and cooldown would require balance testing. Sabotaging could be helpful for pushing towards objectives. Any sabotaged sentry/mine kill, med station heal would be rewarded points to the merc using sabotage ability.
The only thing I’m not sure, is whether sabotaging snitching device and heartbeat sensor would be OP, and should be left alone.
P.S.
This idea was inspired by Fortress Forever spy class.