Size Does Matter

[MLG]

Afternoon 50 rebuy on Stars. Loose fishy player limps UTG+2 with blinds at 100/200. I make it 800 with AcJc, SB calls and limper calls. Going to the flop SB has 14737, limper has 10288 and I have 13630. Flop is 5dJh4d. SB leads for 1400 into the 2600 pot. Limper folds...now what? SB seems like a solid competent player, but I don't really know anything about him and havent seen him show down a hand.