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This fly didn't stay posed for long, but I did get this one photo showing the fly with a "hitch-hiker." I did not notice the hitch-hiker at the time I took the photo.

I don't know if this looks right for a pseudoscorpion (all the images I can find show their dorsum) but I can't think of anything else this could be.

As for the fly, I think it is the same species I have posted before, which Andrzej was kind enough to identify as Scoliocentra helvola (with a note that taxonomic changes may be coming in and around this genus).

True that this is a pseudoscorpion?