Saw MT spawn

I

I am pretty sure Master Thief spawns here.  When I walked into this path I saw Master Thief's name show before I got close enough for his normal ambushes.  After his name showed he stood there for a few seconds and didn't see me or didn't want to fight yet.  So I think he spawned there but it's really hard to tell, because whenever he pops out at you it looks like he just spawned.