Double whistle - How should this be handled?

[Chuga]

L was late getting his spot which caused a late close down. L should have never signaled PC. Have a patient whistle and make eye contact with the C. That would have told him the C has a different call from a different angle. Talk it over and work as a team to get the call correct. IMHO, the defender never established LGP, feet and body were still moving.