What, that you didn't come save them from themselves? lol.
I have noticed that even when a player is 'good' mechanically, they are often just as bad at map awareness/objective control. Had a graves jungler who put up a good score, but mostly by just bursting champs after someone else initiated, who had no concept of when to actually gank a lane. He just shows up to my top lane, where I got first blood on wukong against leesin, but just as the lane has pushed to outside his turret range. He then sits in the bush for 10 seconds while lee farms at edge of turret, until I recalled, and no, a turret dive was not a good idea at that point. Think I was lvl 4 to lee sin's 3, not enough burst or tankiness to ensure it'd work.
I normally jungle, so I tried to keep lane frozen closer to my turret for optimal ganks, and he instead skips over my lane on next two rotations. Lee then got his sustain off W leveled up and I couldn't harass effectively anymore. Could have easily snowballed both of us hard early game.