[GAMEPLAY] Sion and Azir Ult interaction

Just got done with an ARAM game and felt the need to get this posted quickly. Playing as Sion, I randomly stopped ulting halfway through. I thought maybe I'd messed up and misclicked something. Turns out, I'd run headlong into an Azir's ult wall. I'm not entirely sure how its supposed to work when its Sion ult VS Azir ult. It is technically physical terrain, in the same way Anivia or Trundle produce. But the problem is, the Azir was on MY team. It happened 3 times that game (unavoidable in ARAM, sadly) so I felt the need to come report it. As for reproducing

1. Have a Sion and Azir on the same team (I'm assuming any map will do)
2. Have Sion ult toward Azir
3. Azir throws his wall so that it obstructs his allied Sion

I did NOT get affected by any sort of knockback from its activation, and once I was done ulting, I was able to pass through the wall freely, as allies are supposed to. The collision did happen EVERY time I ulted his wall, however. So it wasn't a fluke.