In MI6's subterranean lair, M prepares to interrogate the bad guy, who is being held like Hannibal Lecter in a big glass box.
Bad Guy is angry at M because he was tortured for five months. He protected her secrets, but she disavowed all knowledge of him. He feels betrayed by her.
With no way out, Bad Guy used the cyanide capsule in his tooth. But like Bond falling off a bridge, he didn't die. He took this as a sign—to look into M's eyes one last time.
M tells the Bad Guy that he—Mr. Silva is his name—will be transferred to Belmarsh Prison.
Silva channels Beyoncé to ask M to say his name say his name.
M won't say it again. She tells Silva that his name was on the memorial wall at MI6 headquarters, which he almost blew up. Oops.
M will have the name struck off, and no one will remember Silva. Ever.
Don't mess with M.
Before M leaves, Silva shows her what hydrogen cyanide does to a person. He removes his teeth, which are connected to large plate supporting his face. All his skin sinks in, making him look like Sloth from The Goonies.
"Look upon your work, mother," Silva taunts M.
M leaves. In the hallway, M tells Bond that the man's real name is Tiago Rodriguez.
Beyond her orders, he began hacking into the Chinese, so she willfully gave him up in exchange for six agents who had been taken hostage.