“Now you’ve done it,” he announced to the room in general, then his eyes lit on Carlton,
unfettered.
是什麼意思

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"Now you've done it" is usually used to express when you want to point out that someone has done something stupid which has caused a negative consequence. "It" is referring to the consequence of the action. This has a similar nuance to "I told you so"

"announced to the room in general" means that he isn't announcing towards any specific target, but just announcing for whomever may be listening.