[AlanBostick]

I like the raise. Seat 5 isn't going to call even a single bet unless he's lost his marbles. Seat 7 looks to me like he limped in with three clubs, and caught "lucky."

You caught an ace. Seat 7 probably only has the bare pair of jacks -- all the more likely since seat 5's brick is a third jack. Your fourth-street raise with your ace creates the fear that you have aces.

Unless you catch another ace on fifth -- which is terrific -- you will act last on that betting round, which means that if you brick off on fifth you can take a free card, which you will need.

And, of course, if you catch an ace, 4, 6, 7, or 8, you can go to town with the betting. With an ace you have the best high hand plus a super low draw; and with the other cards you wind up with an almost unbeatable low lock freerolling for high.