Go, giant flying shark!
A man-sized shark with huge, wing-like pectoral fins shoots into the arena and glides towards the arrowhawk, its toothy maw snapping viciously, hungry for prey.
Does the arrowhawk, by any chance, count as flat-footed? Either way, the terlen's making a flying charge at the arrowhawk. If the bite hits, it'll go for the grapple and worry.