Stud8 - Is this Collusion?

[roggles]

Scared of sounding stupid, I have to say I've never seen this play before. Can you explain why this play is actually good for him... So he feels his 2743 is a good enough low draw that he must call down against a 235 board? I find this a little sketchy, and I probably find a fold better for him. Anyway, he puts me accurately on a pair of aces and figures that he wants to make his 44 good for high so he pays two extra bets to draw pretty thin against a good board?

I just don't see how this play helps him.

How can I tell that this is the type of play he is doing in this hand? Would you have called here?