6+.5 turbo sng at stars. My reads are the guy is semi-aggressive, but prior to this hand I had just bought the last 3-4 pots without showdown. What do you do here?

PokerStars Game #1557035854: Tournament #7188699, Hold'em No Limit - Level VIII (200/400) - 2005/04/20 - 21:09:26 (ET)
Table '7188699 1' Seat #1 is the button
Seat 1: bdawg56kg (6095 in chips)
Seat 5: dauid (7405 in chips)
bdawg56kg: posts the ante 25
dauid: posts the ante 25
bdawg56kg: posts small blind 200
dauid: posts big blind 400
*** HOLE CARDS ***
Dealt to bdawg56kg [3d 4d]
bdawg56kg: calls 200
dauid: checks
*** FLOP *** [6d 5h 5d]
dauid: checks
bdawg56kg: bets 800
dauid: raises 6180 to 6980 and is all-in
bdawg56kg said, "big hand here"
bdawg56kg said, "3d4d"
bdawg56kg: ???