In chapter 2, page 8, we saw Inazuma (the ninja) looming over the unsuspecting announcer. This was the last time we saw Inazuma. Then, in chapter 5, page 4, Accelerator (who can read minds) looks at the announcer and says "Wait, aren´t you... No, nevermind. Later, maybe." I think Inazuma hides from Yotsuba (the medium) who is trying to curse him.