Live $75 10K rebuy tourney, 5k add on for $20 at first break.
100/200 blinds, 45 min in
Hero on btn A

5

with 12K
2 limp, hero calls, blinds complete
Flop ($1000) A

9

3
Vil ($4200) in mid bets $400, I call, rest fold
Turn ($1800) 6
Vil checks I bet $1000, he jams $2800 more.
This guy is a regular break-even 1/2NL player. Not very sophisticated. I put him on a weak A or FD but when he failed to protect on the turn I narrowed it to the FD.
I did screw up not paying attn to his stack size and assumed he had 8K or more when I bet the turn.
So my questions are:
1. As played call?
2. Action vs his turn check assuming he has 8K+?
3. Action vs his turn check with his 3800 stack?