英語版FF9日誌35 : He fusses a little from time to time, but he hasn't been all that bad.

Marcus:
We locked that old knight up in the instrument storage room. He fusses a little from time to time, but he hasn't been all that bad.

 fuss : 空騒ぎする,やきもきして歩き回る

He fusses a little from time to time, but he hasn't been all that bad.

all that ~で「それほどまでに～」という口語的表現です。
つまりここでは「時々少し騒いでるけど、そこまでひどくはない」といってるわけですね。