Well, if you try to stop on a cell rather than walk past it, it will still result in un-invisibility and the inability to step onto it. It's mechanically impossible for more than one character to occupy the same cell.
And what if one sits on the other's shoulders? In theory, you could use a player as a mount, why not? 🤔
Небо – угроз не слышит
Небо – ведёт особый счёт
Небо – тебя найдёт