Well, he was, but he disappeared just after Candlenights. Time is a little weird, here - I think it's like a pocket dimension, maybe with some sort of Refuge-esque time bubble around it. You can disappear from this world and go back home without any time having passed, and sometimes people just sort of... come and go. The coliseum seems to be the entrance, or at the very least, the place where people arrive when they turn up here.

[ There's a brief, hitching pause in the Director's voice that catches Angus off guard for a moment, and all of a sudden, he remembers the last time he saw Magnus, back home - barging in through the doors to the Director's office, alongside Carey, while the Hunger started to rain down outside. ]

... Um, Madame Director, if you don't mind me asking... speaking of temporal anomalies, what's the last thing you remember? What were you doing just before you arrived here? I may be further along in the timeline than you.