The thing is.... not sure if it was a glitch. [Tenka pauses as he tries to explain--] Sousei's not a fully-fledged exorcist or anything, but his sword's of more use than he is. He was able to use that to help out some people and dispel a couple of actual ghosts, not glitches.

[So there's probably something paranormal going on here. Though it does lead well into the next question:]

No solution for the big guy, though. Even Sousei's sword couldn't do anything and it never tired out. We could only distract it for as long as we could so that nobody got hurt.

Pretty sure we would've tried something else if it stayed a problem but... we didn't have to, luckily.