325 is only 75 points from todays high or 0r 2.5%. Thefore from todays low on spxu you can expect it to go lower by atleast 7.5%. That is 3 times the move of spx. If spx goes to 2250 from 3250. That is a move of 1000 points or roughly 31%. In that case you can expect the max move in spxu of about 93% higher, from the point where spxu stood when spx was at 3250. There is some decay associated. But the faster the move down the lesser the decay.