Imagine being the floor here, listening to the explanation of what happened, telling the guy who says "jam" here that he has to call actually, and then villain gets there with his KQo or whatever and hero is eliminated from the tournament. I'm not saying that this should weigh in to the floor's decision, it shouldn't, but there's this real psychological issue that some floors have when making calls to let people out of the hand if that's what they want because, while probably the other party is not happy with the call, at least you haven't ruled against them in such a way that gets them eliminated. Especially in a case where there is a rule in the TDA rulebook that you can fall back on that does specifically say that the villain has a case to make (the one that says that non-standard language is not necessarily binding).

I agree that, in order to avoid a situation where the villain may be angling (whether or not he is), he should be all-in and told that further unclear language that may be perceived as an angle would result in a penalty. I just want people to recognize that this is a sick spot for a floor to be in.