User blog comment:Leyrann/New Summoner Spell?/@comment-71.17.69.225-20120709224820/@comment-4834593-20120710093934

What's bad about a one time usage?

Yes, you can make a kill early. You know, I've made tons of level 1 first bloods top lane. I seem to love it, or something like that. Even though I've done that, I've still died to a jungler gank, after which my opponent wasn't behind anymore. I've even died three times in lane, and still won after that, just because I had Malphite, and my enemy, Kayle, could not do anything against my ult...

And yeah, it is indeed meant to shut down a fed enemy once. But you either use it early in an attempt to win your lane, or late in an attempt to win a team fight and ace for a push. Decisions, decisions.