The arrow being too short is understandable (at least on my end). We've got tubes attached to the wall of our range with several different lengths of several different brands of arrows. We use these to tune people's bows [who don't provide their own] or for people to test bows with. The arrows aren't marked, but put back into their respective tubes.

This particular arrow happened to have been placed in the incorrect tube.

As far as having my hand near someone's bow at full draw, it happens all the time. I adjust as last three peeps a day while customers are at full draw. I trust them enough to have the common sense to keep their finger behind the trigger.

I wasn't hurt too bad. After the customer left I grabbed a bow from the shelf and went and shot it to make sure I could still shoot mine. Nothing major, just a bruiser wrist and a scraped knuckle.