Why isn't troll picking in ranked reportable?

So i just queued up for a game of ranked as a jungler. My mid-laner's zed got banned by the enemies and he decided "iLl gO hECaRim mID wIth smITE aNd gHost."(he already locked it in btw) I obviously dodged because no one else wanted to and i'd rather lose 3 lp then like 20, but i feel that the player in question deserves a report. So i'd like to know if there is a way to report players without going to have to play the game, most likely lose and wait for the after match screen to report players for any future encounters with troll pickers. Because no way am i sitting through half an hour of a game which i know i'll most likely lose just to report someone. Thanks for the help.
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