5 second count in NBA?

[Mark Padgett]

I was flipping channels between hockey and basketball and just caught the end of what appeared to be a 5 second count in the Raptors - Knicks game against the Knicks when they were on offense. Can anyone explain what happened? Thanks.

I know there used to be an "illegal offensive set" violation in the NBA where 4 players were on the weak side above the free throw line. Was this it?