Enemy Graves was at 10% hp

Because you got in his range, and your team didn't blow him up.

Er, don't go in melee range of lifesteal Graves maybe?

Is this an algebra test? They often come with stupidly absurd premises (John bought 15 watermelons) and then ask the weirdest questions.

I agree graves is extremely unbalanced right now, as it is virtually impossible not to lose top lane as him, and he doesnt fall off too hard lategame. Maybe I'm just salty and low-levelled, but it always seems that the team with graves has a great chance of winning.

I'm going to guess it was at least two of the following combined with the Graves being near full damage and his target having next to no armor:

• Death's Dance
• Bloodthirster
• Warlord's Bloodlust