Any Viper tried dancing in zak body?

Yah I do it every zak run (except I use dragon strike after screw punch). Saves pots and looks cool. Did it on HT's legs when HB ran out because the DK died. I couldn't take a hit from stomp at the time so I woulda been killed by stomp once HB ran out.

I thought Dragon Strike was slower than Double Upper. O_o Neither have invulnerability frames, so how does that happen? O_o