Obvious fold?

[bhp374]

PLO $1-2 Blinds
HERO has 5 [img]/images/graemlins/heart.gif[/img]9 [img]/images/graemlins/club.gif[/img]9 [img]/images/graemlins/spade.gif[/img]j [img]/images/graemlins/heart.gif[/img] in MP with medium stack
7 others see flop for $2
Flop is J [img]/images/graemlins/diamond.gif[/img]J [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/spade.gif[/img]
EP (big stack) bets the pot ($14)
Along w/ everyone else, I fold.

It seems to me that this is an obvious fold. Even though I flopped trips, I've got to think that Villian either has the other J or 77. If he's got the other jack and is not full, then I'm probably out-kicked. Even if I were fill up, it still might not be good. Also, if I call and do not improve, there's a flush draw to worry about.

This seems like one of those lay-downs you've got to make, but am I thinking about this the wrong way?