How would you handle?

[Dutch Alex]

A good umpire would, if unsure about the ruling, always ask his partner.
If the both of you are not sure, then do what you think is most fair!
The coaches of both teams have the right to protest, if they think you're wrong in your ruling. At that point, don't worry! Others are in charge. They will then with the rule-book in the hand look it up and make the correct call. So you might play it over from a certain point in the game or the complete game. But things can be corrected, afterwards.