[BillyMac]

Originally Posted by bob jenkins

If L (and apparently others) thought it was the first of multiple FTs ...

Any chance of miscommunication, or misunderstanding by all the players, I'm going with the possession arrow.

Below is certainly not a completely relevant casebook play, but it's the only one that's close:

8.6.1 SITUATION: A1 is about to attempt the first of a one-and-
one free-throw situation. The administering official steps
in and erroneously informs players that two free throws will
be taken. A1's first attempt is unsuccessful. The missed free
throw is rebounded by: (a) B1, with all other players
motionless in anticipation of another throw; (b) A2, with all
other players motionless in anticipation of another throw; or
(c) B2, with several players from both teams attempting to
secure the rebound. The officials recognize their error at this
point. RULING: In (a) and (b), the official's error clearly put
one team at a disadvantage (players stood motionless and
didn't attempt to rebound). Play should be ruled dead
immediately and resumed using the alternating-possession
procedure. In (c), both teams made an attempt to rebound
despite the official's error and had an equal opportunity to
gain possession of the rebound. Play should continue. (2-3; 2-
10)