I've been hunting on Teras and notice that the red scaled thraks and cinder wasps will flee after being stunned or killed by 716. Is that by design?

A red-scaled thrak claws at you!
AS: +268 vs DS: +334 with AvD: +37 + d100 roll: +20 = -9
A clean miss.

You exhale a virulent green mist toward a red-scaled thrak, instantly infecting it. The red-scaled thrak convulses violently!
... 30 points of damage!
Frightful blast to the face strips flesh to the bone and removes left eye!
The red-scaled thrak falls back into a heap and dies.
A red-scaled thrak darts east.