Firefly Glen make it make sense

In such open spaces, he did not take very long to pick up a rhythm with long legs like his, so he found a stride to stick to fast. With the darkness gleaming and him more than comfortable with the depths, he sprang his entire posture upwards when she bowed ahead of him and loosed a soft yip of his own to go with it--which he soon redirected his momentum in response now that he understood the universal language of chase. His jog glided into a full on canter on the next stride he made, not giving her long to gain ground on him.

He thought less about how heavy all the air seemed then as it rushed to his lungs and his gaze was set ahead, tracking the churn of Wraen's hips as she ran. Flattening himself out, he galloped after--and when he could hopefully reach her, he aimed to bump against her side--shoulder first likely, stride pending, before he lunged forward, faster, ahead again. Tag. Every throw of his paws went further than the next, zig-zagging him through the fireflies as he sought the smoothest course over the landscapes.