User blog comment:TeamS5/Help!/@comment-5238542-20130711170239

first, if a mate is feeding, ping/tell them to stay safe and farm under turret. ping when you come to help him and go in first yourself letting him follow, make sure tough that he is in range cause otherwhys he can't help you. if you find yourself needing to gank other lanes alot, buy boots of mobility.

second, champions that are really hard to stop if fed are vayne, her dps is just amazing even without mutch core items, and needs attack speed more then other carries, her only problem tough, is that if her laning phase was really bad instead of bad, u can't do that much in teamfights, jax is a champion that is really hard to stop aswell, and if you are going jax, try to get an orianna in your team. let her put her ball on you, and jump in for easy win. even without being fed that much, jax is one of the strongest teamfighters in the game, as he has an AoE stun and gains defensive stats of ult. last is xin zhao, he is really hard to stop late game as long as he can attack, and is one of the few capable of making a 1v5 penta, as long as they don't have to much cc.

hope this helps, if you have any questions, just askt them