Always Wright,
You can find a link to a video of the play on this webpage:
http://mlb.mlb.com/mlb/gameday/index...lb_1&mode=wrap
As you suggest, it seems plainly obvious to me that Church ran well beyond 3' outside of a direct line from where he was to home plate once Hill gained possession of the ball and initiated his ill-fated tag attempt.
Interestingly, he never "changed direction" during Hill's attempt until after he was past the plate. I believe a major league catcher would have tagged him out regardless.
JM