I just played the map and noted two things: #1) At the start of the match it said "An enemy has lost all their bases." and #2) Serena's ice drop was a different color. It looked like something was casting a shadow over it.

In case it matters, I was on red team playing as Pavium. My allies were cutter and serena. The blue team was Anders, Pavium and colony. All were legendary ai except serina who was set to heroic. All ai were set to random leaders at the match setup screen.

I also didn't notice any music.