Steelrunner wins in a race anyway so if they run it suits me, and you can always just keep Nicrobursting them if they use new metals, as for what they're affecting if it was anything to do with you you'd notice, so it can only affect other things. The difference is that you can actually use Nicrosil offensively, wheras Chromium (Especially without any other abilities) Just puts them on a level with you, not to mention all they need to do is down another vial of metal and they're fine again. If you Nicroburst their vision they're going to be disoriented and probably stay blind for quite some time, if you Leech them they just need another vial and they can see perfectly fine again and can use their metals at will, but even if they replenish their metals from a Nicroburst they know they have to be careful about using them or you'll turn it against them.