Rashi on Numbers 22:29/רש"י על במדבר כ״ב:כ״ט

1התעללת — Understand this as the Targum does: an expression denoting scorn and disdain — [THOU HAST MADE SPORT OF ME].

2לו יש חרב בידי I WOULD THERE WERE A SWORD IN MY HAND — This utterance was a great shame for him in the sight of the princes: this man was going for the purpose of slaying a whole nation by his mouth, and for this animal he required a weapon! (cf. Midrash Tanchuma, Balak 9).