25/50 River Spot vs sweetluvin

[Stinger88]

POKERSTARS GAME #12286515029: HOLD'EM NO LIMIT ($25/$50) - 2007/09/26 - 18:15:18 (ET)
Table 'Hispania' 6-max Seat #6 is the button
Seat 1: ADZ124 ($5748 in chips)
Seat 2: idoubleL ($10136 in chips)
Seat 3: sweetluvin7 ($9612 in chips)
Seat 4: $tinger 88 ($10564 in chips)
Seat 5: DaMadPotter ($5150 in chips)
Seat 6: yojje ($12122 in chips)
ADZ124: posts small blind $25
idoubleL: posts big blind $50
*** HOLE CARDS ***
Dealt to $tinger 88 [Ah 8h]
sweetluvin7: calls $50
$tinger 88: raises $150 to $200
DaMadPotter: folds
yojje: folds
ADZ124: folds
idoubleL: folds
sweetluvin7: calls $150
*** FLOP *** [Ac 4s 6d]
sweetluvin7: checks
$tinger 88: checks
*** TURN *** [Ac 4s 6d] [8s]
sweetluvin7: checks
$tinger 88: bets $350
sweetluvin7: raises $550 to $900
$tinger 88: calls $550
*** RIVER *** [Ac 4s 6d 8s] [3h]
sweetluvin7: bets $1050 (into about 2200)

I'm assuming nobody's folding, call or raise and why?