I expected something like this to happen. Something was bound to happen to interrupt their meeting. I guess Iori was just too late... but now maybe he'll get his head on straight and start thinking about Itsuki a bit more.
I don't like how Iori is so undeveloped character-wise compared to Seta and Itsuki. Right now, though I'm in favor of Seta X Itsuki, I'd still feel a little sad for Iori.