Ple-Sen
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especially not "unexpected rules" (because no rules were introduced at all)
This wasn't in the rules. There was also nothing in the rules about hanging, or rather its prohibition, at the tournament. I joined the alliance and planned my battle strategy expecting everything to work in a similar manner. I was mistaken and overlooked it — no argument there. But it still affected my actions. The issue here isn't about suddenness, but about ambiguity.