Protoss Vanquisher

My Zerg concept [link]

So I had this idea for a new mechanic in StarCraft 2 where units can get pushed in directions. More specifically, ground light units get pushed back the most, while medium sized get pushed back less and massive even less. At first I thought it was just another version of the Sentry's ability of force field, but after thinking about it more, I think it could have very different, fun and high level micro play applied to it. So I gave this ability to this new unit I call the Vanquisher. This would be a higher tier unit, that has to use energy to use the ability. Now as far as what you could do with the ability; for one, retreating from battles would be one way to use it, by pushing the enemy's army back. Another way is if you lined up two Vanquishers, one on each side of a group of enemies, the shock waves could be fired at each Vanquisher, sandwiching the enemies together causing great amounts of damage. The ability could also compliment sentry play, if a wall is created with force fields, the Vanquisher could then shoot a shock wave and instead of the enemies getting pushed back out of range, they hit the wall so your forces can get safe projectile attacks off.

Tell me what you think, or if you have any other ideas how this mechanic could be used. : )