Flash the death sentence, flashes traded.
Even better, spell shield as sivir while your Alistar knocks them both up and they die miserably.
Or how about that Morganna spell shield that stopped the hook letting you reposition as Varus so you can ult, auto twice then E for a kill.
Or Tahm Kench who went "nope" and ate you while stunning whoever had tower aggro with his tongue for an easy kill.
Or that support Taric, who dazzled the Draven, healed you then smashed them like glass.
Oh you were alone under that turret without summoners against two high health opponents with summoners who had likely outplayed you severely in the lane already?
Tell me more about how what happened was unfair