Because using magic just backfired and made us botch social contact and now we are in the street. Is it reasonable to cast F6 improve logic in the middle of the street? The way you describe that neighborhood we could not even bring the car how violent/hostile does people become in Thamal if they notice Mark uses magic?
The way I see it, the spell only made Harka go crazy because of the already really, really tense situation: Two strangers come into his clinic, ask weird questions about his illegal business and kind of (or at least indirectly) threaten to blackmail him. He was alone against the two intruders, nervous and probably scared and only waiting for an reason to call his security-ork to throw us out, so under these stressful circumstances it it should be understandable that the spark of a spell being used in enough to throw him off.
But now the circumstances are completely different: you are - correct me if I'm wrong - in a local momo-citchen where nobody expects hostility or is watching you closely. Alternatively, if you still think the risk of using magic is too high, you could just look for a more secure and secluded area: in the case of Thamel there is probably some kind of massage-spa close by, or you just visit the restroom (should they have one).
Over all, hacking the clinic really is such a golden opportunity, I don't think we should miss it:
just think of all the data Harka has, probably the protocol of every operation the temple made the kids go through, that's pretty much
all of the data Mrs. Johnson wanted from us! If Mark could extract the data, this would save us the trouble of stealing it directly from the temple, (or murdering Harka and his security-ork to get the hardcopies from him,) which should be a hell more trouble.
I think that would be worth one point of edge and maybe going somewhere safe, but Mark is your character, I'm just giving my opinion on this because I think the resluts of hacking the clinic effect the whole team.
Previously we were alone in a clinic so how many people could possibly notice it. The way you described that neighborhood even bringing the car was impossible so Mark could not use that for cover.
Bringing the car was impossible due to the extremely narrow streets, and because someone could have stolen it, but again: bars, brothels and massage-spas should provide sufficient cover. Or you can just call Scarcrow to cover you.
@GM: How is the location Mark chose? Does it provide cover or is it just a rotten street-stand?