Nah.....
My first immediate thought is that perhaps this man recognized your partner from several years ago, he might have known him once; I'm sure if it was dark and the man was a mess Gavin may not have recognized him back.
To posit that because of scenarios such as this "demons" or "spirits" must somehow speak to the mentally ill is to have one thought too many.
EDIT: Also check out the principle of Occam's razor. By that, it's much more plausible that the guy had seen or heard your partner elsewhere than that he can communicate with demons or spirits.
My first immediate thought is that perhaps this man recognized your partner from several years ago, he might have known him once; I'm sure if it was dark and the man was a mess Gavin may not have recognized him back.
To posit that because of scenarios such as this "demons" or "spirits" must somehow speak to the mentally ill is to have one thought too many.
EDIT: Also check out the principle of Occam's razor. By that, it's much more plausible that the guy had seen or heard your partner elsewhere than that he can communicate with demons or spirits.