There were moments when Theo's temper flared up stronger than usual, and this was one of them. He was on edge already from Rodolphus' strange reaction to all of this, and his anger now was completely unjustified. He didn't let his temper show though, but swallowed it and used Rodolphus's apparent weakness to calm himself.
He smiled. 'I wanted to make sure you were properly informed, of course,' he said. 'Montague is a Death Eater, I assumed you wanted to know the details of what was going on.'
'Is there something you need from me, now that I'm here.' he then asked, draining his glass and preparing himself to get up and leave if the answer was no.