ITM with stacks:
SB 3700
BB 10500
UTG 800

SB posts 100 :Kh::Th:
BB posts 200
UTG bets 800 all in
SB calls 700
BB calls 600

Flop
:Ts::As:

SB checks
BB

Questions:
As the SB, should you have bet instead of checking
As the BB. Do you bet or check it down