So we were going through Sen's Funhouse, with me hosting. After making it to the Balders, I get invaded. My friend doesn't see the message, or hear the sound. I know this because we were using Teamspeak to communicate, and I had to ask him why the hell he wasn't gearing up for the invader. He had no idea what I was talking about.
Turns out only I could see the guy, and the invader can only see me. They were able to hit each other if they managed to land a blind swing--but each hit would only do about twelve damage. We're talking what should be considered solid hits, without shield DR.
After the guy lagstabs me, I head back and resummon my friend. This time, though, I pick up another guy to come along for the ride--only this time, those two can't see each other. Both could see the inevitable black phantom that showed up, but that's it. Enemies that one would attack would be stuck in a random animation for the other, including the Iron Golem. This isn't even the first time something like this has happened to us during a Sen's run. Never seen it happen anywhere else, and we've run through a game and a half together already.
On top of this, we've both witnessed strange events like two boulders coming at us literally one after the other, or that one leaning man-serpent guarding Logan's wall not get hurt when we broke it (he just continued leaning on thin air, not giving a damn).
Has anyone encountered anything resembling this tomfoolery? Better yet, anyone know the cause?
Oh! One more thing. By complete accident, we've realized that friendly phantoms/hosts can parry each other's attacks. You can't riposte, but the parry animation definitely triggers if you can land it. Just thought that was interesting.