Please explain how Gunner and Luke work then?
They may attack a different target, therefore they are "activating" or becoming "active" again.
The initial attack is finished and failed, now they get to perform and additional attack against either the same target or another target.
I'm not sure what there is to explain. The second clause from the first sentence, and the entire second sentence, does not follow from the first clause of the first sentence.
Gunner and Luke work because the same ship is still in the midst of its activation.