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The danger was that he'd interfere with his own timestream, but by the time he found it The Great Intelligence and Clara had already done that so that was no longer a risk.

Also, "dangerous" means that there's a real risk of something nasty happening, not that there's a certainty of something nasty happening. If someone does something dangerous & nothing nasty happens, that doesn't mean it wasn't dangerous; it just means that they got away with it -- this time!