Rundown mechanic

[bob jenkins]

Originally posted by blarson
R1, R3 .... R1 breaks, F1 makes pickoff to 1b, rundown ensues, F6 quickly pivots and throws to 3rd to catch R3 dead.

Who has that call ? PU or BU ?

I'm interested in the replies and I'll post why I ask later.
:-)

Bob

Since the throw was to (or toward) thrid base, BU has the call.