If you move, you can't use AiS, which means you pool, it means your vuln window gets smaller, it means you can cast less AiS with patient sniper. If you then cast MS and SW for movement, it means your Vuln windows will be even smaller and you have to wait on CDs. Why would you even use MS for movement, you have more than enough time to apply Mark and follow up with AiS once the movement is over without losing any damage at all. If you have to move inside your vuln window which you just started, you are fucked too, you are high on focus, you don't want to use SW here (you probably don't even have another charge), using MS will cut you from using a 3rd AiS etc etc. In that case, you could use Barrage and actually use the pooled focus. And it's already 1 less global you could use when you specced into MoC. You won't get that global back.