[UmpJM]

Lapopez,

I'm with Bob on this one.

The rule is a "hold over" from the days when the pitcher was constrained to a "box" rather than to contact with the pitcher's plate.

Some of the more creative pitchers developed "freak" deliveries, some of which involved delivering the pitch while the pitcher's back was to the batter in an attempt to keep the batter off balance and disguise when they actually released the ball.

The rulesmakers decided they wanted to eliminate the freak deliveries, hence the rule.

With the pitcher constrained to contact with the rubber and delivering from either the set or windup position, it is virtually impossible to violate 8.05(f) while pitching from windup or set while in contact with the rubber - though I suppose someone could come up with a way if they really tried.

One thing that is fairly common is to see the F1 do a "look back" during his delivery at 2B when there is an R2 in an attempt to hold the runner. That is perfectly legal and NOT a violation of 8.05(f).

JM