clearstream
(He, Him)
It no more says that it overrides the player rule, than the charm spell or menacing attack do. It doesn't need to, because game mechanics can override player choice. In discourse on games, it is usually acknowledged that player makes themselves subject to rules. They do so in order to enjoy the experience that is thereby constituted.Quote where it SPECIFICALLY overrides the player rule.
As to that, I am not so convinced now that it even is a rule. In context, the text I can find is an explanation of how to roleplay.