Might want to go read some more manga/watch anime- when a character's emotions rise, they always get some sort of power boost. Also, the youkai power is generated within Tsukune. The Holy Lock is just that- a lock on his power that he's actually using. Think of it like a dam: the water (youkai power) is already there, but the dam (holy lock) controls how much of it is actually used/going through
and also, a person becoming a target due to power via emotions is also a very common thing- hence why there's always the thing about keeping one's emotions in control during combat
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