According to the refs as they called the penalty, the play ended with 2 seconds on the clock and Atlanta called a timeout. So, there were 2 seconds left when the penalty was called.
Do teams not have to signal for timeout?
In both of the last two plays, refs reset clock to where player is down - no one signals for TO
Also noticed in 1st half refs added a magic 2 seconds- player was down at :13 but :15 is when next play started
(Very glad Atl just let clock run down from :12 with one TO in their pocket)