I don't think you can kill him at that spot. That was just showing him becoming a Taken and then you fight him later during the "Regicide" mission.
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He can be killed, my buddy & I killed the ogre, but got teleported right before we could kill the colossus too.
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No, I mean I don't think you can kill the Valus the first time you meet him in the story. It's like the first or second dreadnaught mission.
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My team killed him and then we got teleported lol