What is "Borderline"?

[bob jenkins]

Originally Posted by Welpe

Borderline is technically illegal in that he's not coming to a full stop but it is so slight that it'd probably be picking nits to call it the first time he does it. This is the one you want to remind the pitcher to come to a full stop.

Borderline is technically legal in that he's coming to a full stop, but it's so slight than any quicker move would be a balk.

I now use "It's close, but he's stopping" or "It's not much, but it's a stop" or "I saw it and it was legal." And, I say it loud enough so the pitcher can get the message.