not sure how you want to do this so i left sven's attempt pretty vague P:
Ravenna's growl pulled the boy's gaze away from her brother, and while the sound only increased the intensity of the heat creeping up his spine, her stance offered him hope of relief. Still, overall, he was unsure of in what tone exactly he was being challenged. It occurred to him that perhaps he should've avoided these two from the start, but now that they had been engaged, the Archer heir would not back down from any of their challenges, whether they be playful or not. Returning her growl with a daring chuff, he sunk into a low crouch, bracing himself for whatever she might throw his way. His tail whipped behind him as he strove to hide his uncertainty from his eyes.
He bounded forward with moderate momentum, unwilling to plow her over but still aiming to bowl into her. It was akin to the same measured caution he used with his mother, though nowhere near as tender. The boy wasn't all so sure he would feel any qualms about hurting this other cub, but knew that it would be unwise to do so, especially with her companion present. He could take her on his own, he was sure of that, but two on one might be a little more difficult. Regardless of the contact made, he would attempt to topple and stand over her, instinct telling him that that was the way to assert himself and solve whatever uncertainties might exist between himself and these strangers.