O8 question

[knifeandfork]

PLO8 home game (7handed), mostly nl holdem players of avg or so skill level.
I have AcQcKd3d on the button. Utg limps, laggy utg+1 doubles the blinds, fairly tight pseudo nutpeddlar calls, as do i, and the big blind comes along.
Flop comes down Ks 5s 2s
BB checks, straight forward avg player utg pots it (he might do this with the nut lo draw, or the flush) laggy reraises( i think he has spades but not the nuts probably with a low of some sort also) the pot, tighty folds and the action is to me nut low draw and about 500-1 for high what is your play here? my read is utg is going to call the reraise, and bigblind is going away. thanks for the responses results to follow.
jason