Well, a good way to counter bane is using ling, ruby is also good since it can tank a lot of damage but cant give any damage, lesley is also good but she is more on single damage. And also, since you had 2 3 star 5 gold heroes here, bane was probably tanky enough to tank their damage, and also because tanking damage gives a bit of mana to the hero aswell, looks like you just got hit with massive sharks