The Evil Twin - how to complete?

[I'm proud of you, son]

"Try to activate the thing on the floor."

Except it seems completely random. There's no button to press to activate it, and the colours don't appear to do anything either.

What the ♥♥♥♥ is with this fight? I ♥♥♥♥♥♥♥ hate ♥♥♥♥ like this. "Here's a boss fight gimmick. You've never seen ti before, and we're not going to tell you how to do it. Have fun just running and dying until you, maybe, figure it out."

Give me a ♥♥♥♥♥♥♥ break.

[bender]

the boss will have a color appear around him when it does go stand in the circle that is the color he is showing

[Quelex]

You need to keep your eye on the bosses and not as much your own positioning to see the symbol and color of which one is the right one. You need to keep circling the arena if you're a ranged build and keep attacking while you wait for the next symbol.

I was able to do it at level 28 on Huntress but it took 10 deaths and looking up the gimmick. They need to give Bryan McRipped better dialogue to tell you what to do more clearly.

[Derinis]

Your little navi-like helper gives you hints throughout the fight. I know it might be hard to read, or even see it, but it is there.