Is this catcher interference?

[Larry1953]

Originally Posted by dash_riprock

And besides - what's the difference between an IW and 4 pitchouts?

An IW is counted for official scoring purposes when the catcher extends he gloved hand out for the 4th ball. Once he assumes that position, the rule says that he is supposed to keep both feet in the box until the pitch is released. As explained by Jim Evans above, there is latitude given once the pitcher starts his motion to the plate.