The probability if weaver ants rescue or kill injured conspecifics from different colonies seem to depend on if they smell similar or different than ants of the own colony.
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I really appreciate you providing this additional information, Jaki. It's quite interesting stuff. My observations lead me to believe that they were killing it rather than rescuing it. That's seen from their jaws, which bite their prey's neck and legs.
Yes, in your case the victim could be an already injured weaver ant of the same species but from another colony, which then would suit into the pattern described above ... Of course that's just a guess only ...