When you cast this spell, you can move one willing creature up to 20 feet in any direction. The movement occurs in a straight line, and is stopped by any normal or magical barriers that would stop a body from normally moving in that direction. The movement occurs immediately, and leaves the target in full control of their body and able to act without penalties upon completion. Although the target must be willing to be moved for the spell to succeed, the caster is in ultimate control of where the movement ends, up to the 20' limitation. Once moving, the target creature may attempt to halt their movement at any time by grabbing onto nearby objects--a strength save against the caster's spell DC halts the movement and ends the spell. The movement, while not violent, is sudden, and the target may take no other actions while moving. If they are acting on the same initiative as the caster, the target may elect to take their action before or after the spell takes effect.
You must have a free hand to cast this spell, which you do by indicating with a flick of the wrist the direction the target is to be moved. This movement is not originated by the target, thus does not provoke attacks of opportunity.
Yank the drowning child out of the river, or pull your struggling fighter out of the melee. Or throw your barbarian across the chasm and into the melee. Shoot your archer up onto a rooftop for the battle. Lots of possibilities. Opinions?