Instincts can be a dangerous thing, especially right after one hits their first change into a were. When Gladio hit his however he was still small, able to be controlled. Ignis is an adult and fast on top of that, he always has been.

But Gladio's stamina will hold out. Use to this form, use to running flat out. He doesn't bare his teeth to the other and stays just out of range, but even so keeps herding Ignis back to the blue light of the haven. Dodging the start of daemons, of sleeping animal herds, nudging Ignis to the direction he wants him but falling back as he can. After all the last thing he wants if for him to get hurt, but he has to, needs to exert his dominance over the other to secure his place with him.

To keep Ignis safe in the long run.