It doesn't make sense that a "torpedo" would be a self-powered, guided vessel, beyond its initial targeting and propulsion units.
I can see them getting back aboard something like an assault shuttle, which is basically a very small, very-heavily-armored ship that tries to go from its mother ship to the enemy vessel as quickly as possible to drop off a boarding party. Then that ship just stays in whatever air-lock, hull-breach or captured landing bay it arrived at until its party returns to disembark or has been killed to a man, so the boarding shuttle turns around and goes back home.
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