you're right k1ll3r, the math doesn't apply to these games. It applies to thinking outside the confine of the game and going beyond. Evolving past a "in the box" style of thinking. Stop being so damn linear. I think the fact Scream even bothers trying to use such shade of gray thinking by going past the aspects of a game, and using physics, science, and math, to school you guys is a real feat in its own, because god knows you kids don't know what the hell he's spewing out. What is wrong with showing the realities of what Link is capable of? and developer, programs and coding, those numbers don't mean shit in these debates.
When has Sephiroth ever teleported? Honestly, is there a video or canon quote, proof, facts, cut scene from a game, where he literally teleports? I admit, he is fast. He moves and leaps around with, ease, I have never seen him transcend from disassembling his physical atoms and rearranging them else where, with out the use of having to travel the actual distance from one point to another.
Teleportation usually inquires a energy signature as well, upon the start up and ending actions of the teleport. (i.e. Night Crawler has smoke, Tetsuo has red "electricity", Dr. Manhattan creates a blue surge, etc. etc.) Teleporting is bending space and time and affects the surrounding area when one disappears and reappears. I believe from what I have seen of Sephiroth he merely just moves and travels the distance at speeds not visible to the naked HUMAN eye, fast, but not as instant as teleportation.
by the by, the negative life stream seems to only affect nature and life of a planet, which Sephiroth himself says in the movie. It has no affect on humans. It has never shown feats of it being able to. The only thing other then that is a side effect of the sickness, that doesn't seem to befall anyone except the children since they have weak immunities. It'd take an (X) amount of time to affect a fully, healthy and matured adult.
any who...
side note: there are different ways to teleport as well. Based on how Sephiroth teleports, IF HE CAN, assuming you provide quotes and canon proof stating he's capable of it, then I can help you figure out the speed he is traveling during his teleport momentum. But let me state, teleporation in means of speed of the warp, is not the same as when one starts it or ends it. Those are initial and ending speeds with their own lag. It takes time. Almost all my favorite characters teleport, there's different levels to it in means of speed, travel, energy signature and so forth. It's not "lolBlinkstep".