6 handed fast-structured tournament, blinds 25/50. I've got about 3000, SB has about the same and BB has us both covered. Early doors, so no reads.
I'm UTG +1 with

and raise to 200. SB and BB call.
Flop

SB bets out for 200 and BB raises to 400.
I reraise to 1200 and both call. Given the bet, raise and both players calling the reraise, what's your action following a check and 800 bet on the

turn?