if malphite ult a sion while sion ults who stops who

they stop each other and their lips touch for a big kiss.

they pass through each other.

I would guess sion is knocked up as malph doesn't collide with sion, he merely collides with the ground near him. sion on the other hand has to physically collide with malph but malph is "untargetable"? I think XD during ult soo

When an Unstoppable Force meets an immovable wall...

We need a champ with an abilities named "Immovable Wall". But the nature of the phrase might mean the game will crash if they do. :(