PLO25: Fold a nut flush?

[automat]

Sorry for the format, but the hand converter at bad beats and good vibes doesn´t work.

POKERSTARS GAME #13119922272: OMAHA POT LIMIT ($0.10/$0.25) - 2007/11/08 - 17:19:57 (ET)
Table 'Kurhah' 9-max Seat #8 is the button
Seat 1: Kingpin55 ($15.15 in chips)
Seat 2: lamm23 ($14.25 in chips)
Seat 3: coghill1982 ($12.05 in chips)
Seat 4: BossTrucker ($16.45 in chips)
Seat 5: DollyDigital ($4.25 in chips)
Seat 6: Hero ($24.50 in chips)
Seat 8: Cambln ($18.75 in chips)
Seat 9: dindiri ($121.75 in chips)
dindiri: posts small blind $0.10
Kingpin55: posts big blind $0.25
*** HOLE CARDS ***
Dealt to Hero [Ah 7h 2d Ad]
lamm23: calls $0.25
coghill1982: calls $0.25
BossTrucker: calls $0.25
deesallin joins the table at seat #7
DollyDigital: calls $0.25
Hero: raises $0.50 to $0.75
Cambln: folds
dindiri: folds
Kingpin55: folds
lamm23: calls $0.50
coghill1982: calls $0.50
BossTrucker: calls $0.50
DollyDigital: calls $0.50
*** FLOP *** [8d 4d 6d]
lamm23: checks
coghill1982: checks
BossTrucker: bets $0.75
DollyDigital: folds
Hero: calls $0.75
lamm23: calls $0.75
coghill1982: folds
*** TURN *** [8d 4d 6d] [7d]
lamm23: checks
BossTrucker: bets $0.75
Hero: raises $1 to $1.75
lamm23: calls $1.75
BossTrucker: raises $2.25 to $4
Hero?

Pretty sure I´m supposed to go broke there. On the other hand, what can he make that raise with? Most of the players at this level are weak tight at best and prone to call you down in that spot with something like a king hi flush. Thats why I´m almost positive this can´t be a king hi flush. My flop call looked pretty weak, but why would I raise the turn into two people without the ace hi flush? On the other hand - why would he reraise me with the stone cold nuts, hence risking a fold? How often can this be a set or a str8, not believing in my flush? Just about 0 % imo, as there´s one more player in the hand.

It just doesn´t make any sense to me.

Can I ever fold in this spot?

[sondring]

No, you can't fold. I call and call the river.

Now that that's out of the way what's up with the weak pre-flop raise? You have 3 limpers in front of you and you only make it 3BB? The flop call isn't that good of an idea either. Also, the almost min-raise on the turn?