Tracey and Seamus
Tracey wasn't thrilled about this, but shrugged and simply took her position. While she did cast offensive hexes at Seamus, they were designed more to distract/incapacitate him rather than injure: tickling, tap-dancing, leg locking hexes etc. She used the dingy lobbing spell at him once and was very good at it, since she's been using Theodore's dart board frequently to get out her frustrations, but as she conjured and shot paper jets at him, they were an annoyance and an inconvenience more than anything else.