This sequence happened recently at a table I was playing at.
2 players left in hand.
After the river card, Player A bets 2000,
Player B raises to 4000
Player A then tosses out another 4000 with no verbal and turns over his hand, apparently thinking he had just called.
Since it was a raise, Player B acted and tossed in the extra 2000 and claimed the better hand.
A discussion arose as to whether Player B MUST re-raise the hand since he can see he has the better hand!
Would you consider the call to be soft play, similar to checking or calling a nut hand when last to act?
Or could you claim that Player A might be promoting a chip dump by exposing his hand and "inviting" Player B to re-raise if he has a better hand?
Btw, the actual sequence was a quite benign situation in which Player A clearly made a mistake and Player B was just trying to oblige!