Thankfully the arrow was snatched out of the air before it could do harm — then the fox turned its attentions to the snow. Wide-eyed, Clue watched as it frolicked with the same slowness as the arrow before.

Clue glanced round at the speaker; Aristide Selwyn, his housemate's Ravenclaw brother. The business with the too-slow arrow (and now the too-slow fox!) was apparently not something that Selwyn had anticipated, and thus not a spell he himself had cast.

Clue glanced around the lawn. "Somebody is casting an Impediment Jinx..." but who?