[TheWorstPlayer]

Were they playing normally when you were in the hand and then checking it down when you were gone, or were they playing super-aggro when you were in the hand? If it is the former, it doesn't cost you anything. They are just deciding how to split their pots between themselves - it doesn't affect you. If it is the latter, then you are getting 2:1 on every bet you put in the middle, just go to showdown often.