How do you play it differently?

75 person 20$ buy-in live tournament
30-50 players remaining
Avg. Stack = around 12,000
Hero = 13,000
Villain = 8400

Blinds = 300/600

Hero in cutoff with A [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/spade.gif[/img] raises to 1,800

Villain (BB) calls 1,800

Pot = around 4,000

Flop : 9 [img]/images/graemlins/spade.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img] 5 [img]/images/graemlins/diamond.gif[/img]

Villain (BB) bets 1,500

Villain not overly loose and has a knowledge of no-limit (i.e. not a fish, but definitely has been making loose calls / questionable plays = not a strong player)

Hero Raises to 4,000

Villain Re-raises all-in to 7,600 (3,600 on top)

Hero can fold and leave hand with 6,000 in chips or call, possibly losing and leaving 2,400 remaining

Call the all-in?