Welp. Not a whole lot Ivan can do about that while stunned. He can't even collapse particularly gracefully; look, there he goes, completely without poise. How embarrassing.
Yep, that would be fast-penta, because there goes Ivan's urge to pass out, the physical complaints associated with being tied to a chair, and his verbal filter. Blink, blink.
"I walked out of my office and there he was. Titchy little thing. Very growly."
"Had your cover name and location down to as detailed as 'London' from Mark, dug up suspicious things like buying outfits in Miles's size and affiliation with other Komarran expats and -" Ivan goes into quite a bit of detail about how he came up with sufficient evidence to locate and accuse - "brought it all to th'captain, he recused himself because he'd look a bit suspicious if anything'd gone wrong on account of your being his father, I took a few men and we surprised you all and stunned you, Veli found the keys and I unlocked Mark and brought him home while the others fetched all you arrestees back to the embassy in the other car."
"He said, 'You Barrayaran? What's your name? You can't be Ivan Vorpatril, he's twelve.'"
"After that he said, 'Are you a clone too?', and I said, 'Nnnnno. I haven't been twelve for a while but I assure you I'm Ivan Vorpatril. Are you a clone? Did somebody clone Miles? Shouldn't you be taller?' and he said, 'I'm exactly the right size. I wouldn't be much good if I couldn't pass. Ser Galen'd want his money back,' and I said, 'Are you meant to be his stunt double? What the hell?'..."
"And he said, 'The bio didn't mention you were an idiot.' But I'm not, actually, anyone would have been thrown."
"By a tiny growly clone of Miles popping out from under a table unexpectedly. I was very surprised. I have never been that surprised before or since."