Gangplank bug with images :)
So reading this thread i though eh. Lets test it!
Here are my results
Image 1: Test: Firing at a 1hp barrel Result: Cleave applies on Gangplank Image 2: Test: Firing at barrel with more than 1hp Result: Cleave applies off of barrel Image 3: Activating Crescent and firing at 1hp barrel Result: Crescent applies off of Gangplank
Yar!
TLDR: If they are under 100hp and quite far from you put a barrel down and shoot it before it hits 1hp for a long range cleave strike