He went Hail of Blades and full AD/Attack Speed. He basically ran every one of us down. We couldn't face him due to his high attack speed and damage, so we tried running away from him. But that doesn't work. Because Backstab kicked in then, and we were just dying instantly. I was a Lee Sin with 168 armor and 2.8k hp and I died within 2 seconds of him attacking me.
Shouldn't Backstab get its cooldown back? I just don't think it's really fun and interesting gameplay to die to 2 invisible clowns in 2 seconds, but that's just my opinion.