Saw someone pre-emptively 'booted' from an exit row seat, to my benefit.

Approaching the gate, most people on board, and one GA said to the other, whilst looking at me approaching, "Here comes one". I was a little alarmed at that comment till I noticed a lady leaning against the desk with a pair of crutches by her side.

Was asked would I mind swapping to the lady's exit row seat. I didn't (mind, that is).