Well, I don't really know much about reyvateils. The only one I really got to know before you was Tyria, and she was... odd. And she didn't explain too much about them.

But I think I understand: You and the other I.P.Ds share some kind of empathetic bond. And when those girls got separated from you, they got really pissed... and that transferred into you.

And with that many I.P.Ds expressing negative emotion at once... it must've been completely overwhelming.