Odds are the healer that had blue and the bard(?) that was supposed to have red got too close to one another while trying to feed and they merged. As for why you were kicked, it was probably a premade trying to DF the last one or two people and you were likely the odd one out. I don't see why they'd kick YOU though, if the golems merged it was on whoever had aggro on the two of them, not you.