Serely is claiming vengeful, which means basically if the vig shot him (or get redirected),it will too trigger his vengeful to kill another person, which, as you have said, could theoretically produce an enormous amount of swing provided scum hit goes through+vengekilled townie+vigkilled vengeful townie. Which, provided it happens N1 with a mislynched townie, would start off the game as a 5v3, instant LyLo on D2, and if this happens N2 and after, well, instant game ender.
It really depends on if the mod believes such a possibility can be overlooked, and with Vig being usually liable to blowing their load N1, while redirector having unlimited usage, I personally wouldn't dare to put them in the same game.
Just food for thought.
Like...not really likely, but I seriously doubt if modding will overlook that kind of possibility.