Saying there is no such thing as a tie is true.
Saying that we can always differentiate is false, and your handling of the calls so close is exactly what 99% of us are doing. There was a study that showed that the human eye could not differentiate between events that occurred less than .04 seconds apart - so there's no shame in admitting that you don't ALWAYS know for certain.
PS - throwing a little more physics in. If you see the foot hit the bag, and hear the ball hit the glove simultaneously, you have an out. Why? The speed that the light from the foot hitting the bag is faster than the speed that the sound came from the ball/glove. If you saw/heard them as simultaneous, the ball hit the glove first.
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