PLO50: Donk bet on the river into king hi flush

[automat]

ok, to promote my super-nit image on this forum, one more hand [img]/images/graemlins/grin.gif[/img]:

PL $0.25/$0.50 Omaha - Saturday, November 17, 20:32:01 GMT 2007
Table Loire 6-max (Real Money)
Seat 3 is the button
Total number of active players : 6
Seat 1: John Rambo ( $127.45 )
Seat 2: Cooler80 ( $52.75 )
Seat 3: lucatt ( $43.83 )
Seat 4: IneverWin84 ( $49.50 )
Seat 5: grudev ( $50 )
Seat 6: automat ( $47.75 )
IneverWin84 posts small blind [$0.25]
grudev posts big blind [$0.50]
** Dealing down cards **
Dealt to automat [ 7h, 9s, Kc, Ks ]
automat calls [$0.50]
John Rambo calls [$0.50]
Cooler80 calls [$0.50]
lucatt calls [$0.50]
IneverWin84 folds
grudev checks
** Dealing Flop ** [ 3d, 7d, 4s ]
grudev checks
automat checks
John Rambo checks
Cooler80 checks
lucatt checks
** Dealing Turn ** [ As ]
grudev bets [$2.75]
automat calls [$2.75]
John Rambo folds
Cooler80 calls [$2.75]
lucatt folds
** Dealing River ** [ 5s ]
grudev bets [$11]
hero?


sure, I should´ve raised before the flop. as played, both the flop check and turn call are ok I think, but what´s my river line now that I´ve made the nut flush? more importantly, what hand can sb make that river bet with? is there any hand really that can call a shove?