Probably a lame simple question, but ever since WK changed their FAQ it's tough to find things...
I have a medic and one other character [both] adjacent to an opposing character, can the medic still heal my character?

medics cannot heal if - they are b2b with opposing fig, or if the fig they are targeting is b2b with opposing fig

For that rule, by the by, simply check the original PAC entry for Support. I myself have some trouble with the PDF FAQ, but for this one it shouldn't be needed.