Dang. D:
The only reason I noticed it was because I have them in a clear tub and check on them every once in a while.
If I were to describe what the black widow male was doing, it looks like he was yawning except putting his mouth over the body of the female. It did not look like a feeding or aggressive type of bite in any case.
Could it be that the female is just simply rejecting the male and he's just fed up?