Such falls usually bend the scope at the threads under the power adjust/rear eyepiece. This is the thinnest part of the scope. Shoot at 4X then 12X and see if the groups are in different locations, the next time you are at the range. I would guess that you will be OK, but to change poi that much something bent/moved, especially since you were at 50.

Another quick check, take a frameing square or similar straight edge and hold it against the flat portions of the scope tube/eyepieces in different angles, see if anything looks off.

Since it shoots ok this might seem a bit much, but who wants a surprise in the field.

Why 50 yards? This is not your usual sight in is it?