Is this normal?

[Nektu]

There have been a few times where I go and feed my oldest ball (I feed live very large mice at least 2-3 at a time. wife is highly allergic to rats), and when he goes after it when it is dangling by it's tail from my hand and not really moving, that he'll miss it completely and get nothing but air. I thought it was just him, but the younger little dude did the same thing about 2 feedings ago. Is this a sign of something that I should be worried about further on down the line?