whose call by correct mechanics?

[shipwreck]

ASA manual says for a 2 man crew that there are 4 times a base umpire will make a call at third base 1.On the batter-runner on a triple with no runners on base. 2. On trail runner into third. 3. On a lone runner on a fly ball advancement. 4. On any return throw from the plate or a cut-off player. The book also says with a runner on first only, the plate umpire will observe the play then fade toward third base to cover the advancing runner. With a runner on first and a base hit to the outfield, who should make the call at third if there is a play? Seems like the manual says PU. Dave