He knew she didn't want him to be here for this, but Tony couldn't stand there and watch Pepper suffer. He had given Edward over to Sophie for safekeeping, told Remy he loved her and to watch over the two of them until he got back. He flew up over New York City with Jarvis patched into his HUD, looking for this thing or anyone who might be able to direct him and his firepower. He could be an asset if they needed to bring it down because he had enough strength and explosives with his suit to decimate a portion of the city.
He saw a small group gathering in the area and he zoomed down and dropped, landing with a loud thump to the ground. His faceplate slid out of place and revealed the man inside of the metal suit. "If you guys are trying to kill her, tell me where to aim." He had a look in his eyes that screamed he'd just watched a loved one suffer through something unimaginable and he was ready to take action.