donk play or genius

defending my blind
Full Tilt Poker
No Limit Holdem Tournament
Blinds: t80/t160
9 players
Converter

Stack sizes:
UTG: t6284
UTG+1: t10040
MP1: t3784
MP2: t6555
MP3: t3285
CO: t7045
Button: t4450
Hero: t4985
BB: t3125

Pre-flop: (9 players) Hero is SB with
6 folds, Button raises to t480, Hero calls t400 (pot was t720), BB folds.

Flop: (t1120, 2 players)
Hero bets t800, Button raises to t1600, Hero raises all-in t4505, Button folds.
Uncalled bets: t2905 returned to Hero.

Results:
Final pot: t4320