So the new sprint is lower, why not, but I have a proposition :
You start to sprint to 60% speed, you reach 100% after 5 or 10 second of sprint, and return to 60% when you turn to 90° or when you get shot (the number are relatif to exprim the idea)
In that way, you prevent player from leaving too fast when they are in difficultie and you let them sprint “fast” when they go to long distance. Personnaly, I hate not be able to sprint when someone shot me, so a reduce sprint, even to 40% in this case, is a good compromised