He sympathizes with Tony despite how numb he feels otherwise. This is going to be hard to hear. There's a strong chance it may amount to absolutely nothing. He hates that, but gives him the information regardless. "Natasha pointed out that SHIELD, the real SHIELD if there ever was one, would have stopped HYDRA. He told her accidents will happen and flooded us images of Howard."
He swallows past the lump in his throat. "There's a strong chance your dad figured all this out and they silenced him. He also implied he was using the Winter Soldier to silence people too. He showed us images of his arm and him in the mask before we ever saw Howard."
He exhales audibly. "And that's it. You're up to date on everything you could possibly want to know back home."