I do it one of two ways...1. Wait till the last moment of his flying charge (like Sentry & Falcon) and dex back 4 times, quickly.2. Block his flying charge and dex the rest. His flying charge pushes you back a bit and allows you room to swipe back without panicking.Both those have worked well for me. Uncollected is 100%
It not hard but when lag is ther then it gets harder