Blind Rage Triggered Before Breaking Concealment

Curious if anyone else has seen anything like this before. Just finished a Protect the Device mission with the Savage modifier. As my Reaper was scouting, she came across loot with 2 turns left til expiration, which was odd, because we hadn't engaged Advent yet. Turns out the two berserkers on the map somehow had Blind Rage triggered at the start of the mission, so they had been massacring faceless and civilians since turn 1. Really odd.