$1/2 game. BB is the big stack with $800+ and the guy on the button joined the game less than 30 minutes before the hand. BB has built his stack over 4+ hours and has been playing marginal hands but connecting on the board.
The hand: Button bets $20 and BB calls. Flop 2
7
9
. BB bets $20, the button makes it $60 and BB calls. Turn is K
, both check. River is a 2
. BB bets $100 and after two minutes the button calls.
What were they holding? Did the action make sense?