If Sprint returns, they should make you run WAY faster when using it, but getting shot will make you stumble for a brief moment. This would reward players skilled enough to shoot someone hauling ass, and prevent the situation in Reach where you shoot someone and he just runs away. Halo's long killtimes allow that to happen, so they should make you stumble when shot sprinting.
Also, sprinting a lot faster helps with the whole supersoldier feel they're going for. Idk, probably not gonna end up like that, but that's the way I'd do it. --- Why do you believe that Majora is a female? - BlueGunstarHero Majora's emotions came out through the Skull Kid - BadDecisions