I played Huck only a few times... last time I did he was on semi-tilt after getting crushed at the 10/20 in Bellagio... However, my impression of Huck however would indicate that he would not call 500 with anything less than KK or two pairs (KK and AA really are VERY unlikely to be his hand). I'd have gone on the 200-300 dollar block (looking) bet and hope he makes a crying call.