Let me clear some things on edge of the night
this item was designed for divers of all kinds even maybe the ranged one like quinn or graves
this item was not intended to be a DEFENSIVE ITEM FFS
the 10 sec duration makes it people using it to farm waves, or to poke while having a shield, and this is bullshit
the cooldown isn't the problem, the problem is other people than divers abusing it like jhin you should reduce the duration to 2 or 3 seconds, this will make only divers using it because after channeling they have few seconds to make use of their shield and they can use it with their mobility
jhin or varus walking to the lane with it as a shield won't happen jhin walking to me as darius to poke me hard while being protected from my hook for 10 seconds won't happen