Anger
The more he used this ability, the more they decreased their power in stopping Theo's World Re-Creation.
Not long after, the power was low enough that the World Re-Creation could be activated again.
Without hesitation, Theo reactivated the ability and started to split them. Loki used his ability to let him see the distance between them in the illusion, so Theo could put the same amount of distance to make them think what they saw was real.
Theo obviously cooperated with him.
As soon as the gap in reality was the same as the one in illusion, Loki jumped forth, positioning himself between the slime and the Time God.
With Loki blocking the Time God, the trio could fight the slime without worrying about interference.
The Heavenly Sovereign positioned himself behind Loki so that the slime didn't move in his direction, disturbing the other fight.