That leaves him dazed (can take no actions).
Switching it from "pulling down" to "pushing up" (or vice versa) would be a standard action. You could do both in one round, if you use Extra Effort to surge. If not, you can only put him up this round.
He'll shoot up into the air as if thrown by someone with 50 Str, up to the limit of the Gravity Control area (50 feet).
But the ceiling of the Bernanke Center for Extension & Continuing Education isn't 50 feet tall. The lobby is about 30 feet high, but the meeting rooms (like the one we're in) are only about 25 feet high.
Kenson suggests just using the Gravity Control rank for damage in such cases. Which, at Gravity Control 10, would be DC 25.
Knievel's 19 fails by 6, so he gets another Bruise and he's stunned again.
Knievel may've also broken through the ceiling. I'll say it's got a Toughness of 5 overall (he didn't slam into a steel i-beam), and take 10 on the Damage save. That'd fail by 10, so... that section of ceiling/roof is "disabled." Knievel didn't break all the way through, but there is a generous hole up there now.
End 3/Begin Round 4; Initiatives & Conditions
24 -- Arrowhawk
23 -- Captain K -- held up by gravity; 2 Bruise, Dazed, Stunned
16 -- Doc
13 -- Dark Star
Yes, we're still doing rounds, on the slim chance that Knievel does something Awesome before the cops arrive. ;)