What happened to Ben on 'Lost' last night?

One of the great parts about the ever-so-addictive “Lost” is that in the wake of every episode are a multitude of unanswered questions.

Last night we saw Ben tell Jack he needed to go visit and “old friend” to “tie up a loose end” and then returned looking like he’d just gone 12 rounds with Mike Tyson.

So, was he going to go kill Penny? Kill someone else? Let’s have those theories.