2 man mechanic question

[DaveASA/FED]

Ok here is the situation R1 on first BU in B position, ball gets by catcher and R1 rounds 2nd and heads to 3rd. My question is who has the call at 3rd. I know it depends on a lot of things but what I like to do is #1 talk about this in pregame but as PU I like to get down the line and take the call at third while yelling to my partner "I got 3." But I saw a crew last night where IMO PU was lazy and did not move from behind plate and BU was busting her butt to get there and was in poor position to make the call. She made IMO the right call but it was hard and if the play was closer looked like she would have a difficult time getting a good angle. So I quess I am just asking what do you all do on this type of play? And if you have BU take the call do you cut inside the diamond to save steps or do you still run outside of second makeing you farther behind the play?