His halo will ping someone heading towards him - and it feels like Fou-Lu but... lighter? The confusion is probably made worse by the person who comes around the corner who distinctly does not look like Fou-Lu.

The blue-haired man draws a sword and rushes the reflection, slashing into it with practiced ease. "Hold on, I'm here!"

Never mind that he doesn't know where 'here' is, who this person is, or what he's fighting. Doesn't matter.