Like you said, interference doesn't require intent, but in a case like this it would require at the very least negligence. You have to give the runner the benefit of normal human reaction time - he can't simply vanish. If he's TRYING to get out of the way, and just does a poor job of it, I have no call.
If he just sat there, (on top of the ball, for example) and made no effort to move, I might call interference.
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