Trial of Chaos - Chaos Ring damage in Chimera arena

The chaos ring mechanic in the trial of chaos boss fight in the chimera arena was impossible to see and 1 shot me. The ring initially opened on a top level but the indicator did not show whatsoever on the lower level.
Additionally the rate at which this boss flies away is infruiating, by the time I found him he flew away again. Cool arena & boss but they just do not go together whatsoever, it's pretty annoying.