It is practical? If you don't slow it down somehow it will pass through anything and go away through the other side.

Maybe you can time it to evaporate on your enemy, but that's an incredibly precise timing, and your enemy will literally be able to see it coming and deflect it.

"Aside from permanently rending the very fabric of space and time itself, there was very little collateral damage."

Well, it's not like it's in short supply...