'The red circle manifested itself around the very edge of his platform, glowing an iridescent colour as fire suddenly billowed upwards, moving exceedingly quickly as it had a solid sixty feet height to reach in under a second.' I don't really see how that's vague. 

Anyway, hopefully Skallagrim will have a ruling for us soon and I'll be able to post again today, that should tide us over if I'm unable to post for a while.