Here is the transcription of the audio courtesy of Yahoo Sports's excellent NFL blog Shutdown Corner:
"If he starts to break it, go tackle him," Flacco said to
"Really?" the tight end responded.
"I don't know ... I mean ... what else can they ... they might be able to give them a touchdown on that? I don't know," Flacco told Pitta.
Flacco then approached the offensive linemen with his new tactic.
"Hey! If he breaks this ... if he busts it for some reason? Tackle him! Go tackle him," Flacco said to guard
"Why don't you?" Yanda asked.
"I'm going to!" Flacco said.