Episode "Slow Burn"
Eric and Alexx investigate a murder in the Everglades, during a fire.
Eric: Déjà vu?
Alexx: Don't even think about it.
Eric: Relax it's not going to happen again.
The déjà vu Eric is talking about is the fire in the Everglades in Episode "Slow Burn" (Season 2, Episode 14) , in that episode they nearly died when the fire made a freak direction change and nearly burned them both alive.