Not sure what your are saying here. Do you mean we should bet the river and fold to a raise? I think the SB has $6.40 left and the pot is $7 so thats not really an option for me.
I am not saying we shouldn't bet here. It's 3 handed, the guys a donk and I would actually never put him on cold calling a 3x pot bet with

x. I would put him on either slowplayed flush, maybe

x, 2 pair/lower set or trying to make a hero call with any random pair.