Two questions, AFMBE/SR5E

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First question: Being a relatively new ZM to AFMBE I need some advice, my cast and I got bored of running pre-fabs and decided to do a custom campaign. For the zombies I designed a two phase system for the standard "Zed", where they walk and shuffle around obsticles when in any type of direct light, but sprint and basically parkour over obstacles in the dark, I'm having slight trouble explaining how it actually works. My original idea was the parasite attempting to chemically alter the host's brain to pick up on more sensitive smells and sounds, aswell as develop rod cells in the eyes, giving them animal like night vision, however leaving them much more sensitive to light, and due to the parasite wishing to preserve itself as one good whack to the lower spine essentially destroys it, shuffles when incapable of properly seeing, good idea yay or nay?

Question two: I have this thing where I have literally every game I DM/GM/ZM takes place in the same universe, which after this AFMBE campaign we will run a shadowrun campaign with the AFMBE characters defendants being the PC's (Not directly of course should they die, except maybe the player with a playboy character), I'm considering making Horizon the main baddy for this series. As they do dabbel in pharmaceuticals and super soldiers from my knowledge. Any other ideas though, as I've already done the "Big scary corporation out to rule the world" bit in another Shadowrun campaign.

All answers and ideas will be appreciated