Can a space from Phantasmal Force move?

So, my DM is doing a pvp tourney and I am fighting a Mage (5th level) (I am a Shadow Monk and also 5th level by the way). What happened is that in the middle of the fight, the Mage casted Phantasmal Force in me. I failed.

The illusion was of a corridor with one fireball coming of one side, and I, logically thinking, ran away from the fireball and ended up outside the Arena, effectively losing.

The corridor was "infinite" because as I walked the corridor also moved and depht and etc changed to look an infinite corridor. So my question is, this is right? Can the illusion "move" with me? If so, wouldn’t allow the "effective" area of effect way bigger?