To me, it looks like a check call. I think betting is bad because s/he'll fold most/all hands you beat and raise those you don't. Once you check, an opponent's bet could mean so many things you'd have to call without superior reads. Unless I've been watching this loose passive for long enough to know s/he will not stab at checked pots with short of a great hand, I call and say 'nh'.

Also, did the brick possible offer any poor straight draws?