«وَكَّلْتُ بِبَيْعِ هَذَا الْعَبْدِ هَذَا أَوْ هَذَا»
“I appointed one person or the other as agent to sell this slave.”
Aw allows performance through one of the named alternative agents; the wording does not require both to act together. If one agent duly completes the sale, the other's initial possibility of acting is not an indefinite, separate authority over the already completed transaction.
This distinguishes the alternatives existing before performance from the result of a completed legal act.