this is a must calldown... u say he's a lag shorthanded, and 7 handed is shorthanded enough that he could be playing very agressively.... this could very easily be TT or JJ, it could be A9 (less likely judging from the cap preflop, but depending on how agressive, a possibility), it could also be AK hearts (or AQ hearts if u don't have the Q hearts).... it could very well also be AA or KK, but I think ur definitely good here enough to calldown