What I try to describe is that 'protected' here means 'pseudo-legally protected'. Capture with a pinned piece is not the only case of that; you could capture with a King. So even in the situation below We5xe7 would not be allowed, because We7 is protected by its King. (And never mind that after 1. Wxe7 Kxe7 it would be checked by a Rook.) So what the sentence tries to convey is that after playing WxW you should be able to replace your Warlock by your King, and having his King on e7 would not be allowed for white, no matter whether he is backed up by Re2 or not.
This is similar to Chu-Shogi, where it is of course perfectly legal to expose your King to check under any circumstances, so also when using it to recapture a Lion. It might not be entirely logical in the context of Chess, but I wanted to keep the rule simple. (And Chess players would consider it a very unnatural rule no matter what...) Perhaps I should change the 'not even...' phrase by "not even when such a recapture would expose the King to check (e.g. because you recaptured it with a piece that was pinned on your King).", and omit the second sentence one.
What I try to describe is that 'protected' here means 'pseudo-legally protected'. Capture with a pinned piece is not the only case of that; you could capture with a King. So even in the situation below We5xe7 would not be allowed, because We7 is protected by its King. (And never mind that after 1. Wxe7 Kxe7 it would be checked by a Rook.) So what the sentence tries to convey is that after playing WxW you should be able to replace your Warlock by your King, and having his King on e7 would not be allowed for white, no matter whether he is backed up by Re2 or not.
This is similar to Chu-Shogi, where it is of course perfectly legal to expose your King to check under any circumstances, so also when using it to recapture a Lion. It might not be entirely logical in the context of Chess, but I wanted to keep the rule simple. (And Chess players would consider it a very unnatural rule no matter what...) Perhaps I should change the 'not even...' phrase by "not even when such a recapture would expose the King to check (e.g. because you recaptured it with a piece that was pinned on your King).", and omit the second sentence one.