It could stand to do the same damage as its other TP moves. On me, while tanking, the punch does around 800, Front cone around 600, Elbow drop ive seen do 1200+, but Inferno drop has hit me usually between 1600 and 2000, and can insta-kill anyone else that isn't a marauder. This ability just hates on Melees and anyone that happens to be too close.

*waits for the 'just stun it' comments*