after sneaking in the abode had he met this influential figure he would have cut his carpus.

Why did you post nonsense?

As far as I can see, a translation of your sentence would be:
After breaking into his house, had he met the great man himself he would have slashed his own wrist.

So, we seem to be dealing with a situation where somebody broke into the house of someone he admired greatly, or possibly was terrified of. And this situation either happened historically, or in a famous book, tale, movie, or song.