Hockey is not basketball.  One cannot be defending and trying to score at he same time.  One cannot be attempting to make a basket and trying to prevent a score at he same time.


Context: Two young men playing basketball, one defending the other attempting to make a basket.
Hypothesis: Two young men are playing hockey one is trying to score while the other is trying to prevent a score.

Given this context, determine if the hypothesis is true (Yes, no, or unknown)?