Getting kills with the shotgun give battle runner for 4 seconds, which is good, but you can't reset the timer back to 4 until after is has completely gone away. I feel like it should restart the timer if you get a second kill before the timer runs out
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The reason why is basically Battlerunner is the exotic perk from Mida with a timer on it. (Compare the two, it feels the same...) I've thrown a fit about it a couple times before because I have a few weapons that have battle runner, one being a does not bow which feels awesome with battle runner. So if you let fresh kills keep the perk running, you're basically turning any weapon with battle runner into a mida. Personally I'd rather have Mida buffed in another way, maybe make the lightweight perk innate to the weapon along with it's battle runner, and grant it your choice of armor piercing, explosive, or high caliber rounds.... Or the ability to adjust impact and fire rate up and down... because, you know, it's a multitool... But yeah, basically they don't want to make other weapons into midas.