Hi, cookie,
I think the word “reasonably”, together with the vagueness of the instruction, would justify either full or half movement. As was noted in an earlier post, full movement leaves a word and an acceptable abbreviation, with empty cells in each, and filling the original gaps creates two new words.
However, with half moves, the moved letters could be argued to be shared by two answers each. Mathematically, the half moves are closer to the actual solutions, and “reasonably” may simply imply that we don’t have to hit the precise spot.
With this and the ordering of letters in cells with two letters, this was a good puzzle with a slightly unsatisfactory endgame.