[ It is strange that despite them being so close, the entity has yet to make it's move. She takes notice of Ayato drawing his blade and takes it as a sign to make their move. ]

Right! If it doesn't want to show itself, then we'll just have to force it out. We might as well get the jump on it first.

[ Without any hesitation, Yoimiya no longer holds back her powers, igniting her arrows with her pyro magic. Honestly? She's not even sure if her vision will even work on a creature that appears to be embedded with fire. But she figures there's no harm in trying. In a fiery display, she fires off the Ryuukin Saxifrage, with the full intent of marking the target with her signature goldfish. Instead of aiming it directly at the will-o'-wisp, she diverts her arrow to anything that might be behind it.

Sure enough, Ayato's instincts are proven correct. As soon as the blazing arrow makes contact, Yoimiya's goldfish mark reveals a terrifying anglerfish-looking creature as the true host of the blue flame. ]

Oh my goodness. [ Her jaw slacks open. ] That's a fish!

[ It's not the cute goldfish kind :c ]