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What’s so complicated? O_o There were 50 Warriors in a specific stack, and reinforcements increased the number to 75. During the battle, as long as this number doesn’t fall below the number it was before the battle (50 in this case), the stack cannot be healed. If, after the battle, there are more than 50 in the stack, then all the excess will “burn off”; if, on the contrary, there are fewer, say 45, then that’s how many will remain.