Relic Shield on Thresh is not Executing {GAMEPLAY}
I played a game as Thresh last night and this morning. In both games my Relic Shield would never execute. My ADC and I would still receive the smite bonus if I last hit the minion, however, last hitting as Thresh was very difficult because my item would never "execute." I.e., usually relic shield allows you to smite a minion when they still have quite a bit of HP left, but I can only smite the minion for my ADC when it has almost no HP. I haven't experienced this with any other support than Thresh. But it was pretty annoying and even cost my ADC her life at least once because I couldn't smite minions to get her HP back (then in a very close trade she got killed).