I don't play WW but I'd assume he can auto->q it to wreck it at about the same speed of a q. I'd also assume the important thing is the burst healing more than killing the box in two hits.
Also figure if he can get shaco low while counter ganking Shaco (or beating him up while he attempts to counter jungle him) he turns blood scent on and can chase him down even after deceive
Also Shaco is just bad at counter jungling tanky things at full hp in general
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No problem!
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