First of all, I am sad that this is now a voluntary-only spell. It's niche, for most, was PVP and to lure an opponent into a trap. Now it seems to basically be a very specialized form of moongate. (As far as I can tell... I couldn't summon a character lying down stanced to 0).
Anyway, the other character can't go through the rift as far as I can tell.
> go rift
As you approach a flickering mint green rift, it shudders and winks out of existence.
A flickering mint green rift shudders briefly and vanishes.
You can't do that.