He could be bluffing, but I wont consider it a good spot. If it is the kind of player who doesn't play postflop he could be pushing a small/medium pp, A high or a A5. they don't want to make a decision when a scarry card hits. I hate to make them right if I call and I'm beat.

You didn't play Q4 to spike a four or a Q with no kicker. You gave it a shot, it was cheap to do so. You want to go against those players with some kind of value, you know you'll be payed off.