In this scene, why didn't the other Vulcans sense the presence that Spock sensed?

At the end, she says "Live long and prosper" in English but the rest is all in Vulcan. I wonder if she was commenting on the fact that Spock was half human. Or even taunting him ironically because he failed.

There shouldn't be a caption when she says that, because she says it in English.

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