He wasn't answering his phone. That was enough to worry Steve Rogers out of his mind, because Tony never didn't answer his phone. The out of mind worry was enough for Steve to cancel the rest of his appointments in New York and fly back to Malibu—he gets Thor to fly him because it's a hell of a lot faster than taking a commercial flight—and is placed down on the doorstep. Steve waves to Thor, who flies away with a smile. He's a bit strange, Steve decides, then heads inside to look for Tony.

"Welcome home, Captain Rogers," JARVIS said as cheerfully as a computerized voice could sound. "Miss Potts is at Stark Enterprises and Mr. Stark has stepped out."

"Thanks, JARVIS," Steve replied. "You know what time he stepped out?"

"Around noon, Captain. Something about walking down to get the mail." Steve thought about this for a moment.

"He never walks to get the mail."

"Which is likely why he seemed so pleased with himself." Steve decided he couldn't argue with that and looked at the clock. It was 5pm; he had texted Tony shortly after 3pm in New York, which would have been about the time he'd gone to get the mail… he'd been missing for at least five hours.

"Did you alert anyone when he didn't come right back?" he asked. It was silent for a moment. "JARVIS?"

"You do realize how short of an attention span Mr. Stark has regarding things that are not advanced robotics, yes?"

"You assumed he got distracted and just kept walking."

"I did, Sir." While he was a great butler, Steve decided that JARVIS was not the best body guard. On the other hand, he couldn't honestly say he wouldn't have assumed the same thing.

"Alright," Steve replied, heading for the front door. "I'll have a look around for him."

"Very good, sir."

Steve walks down the driveway and hopes that maybe, just maybe, that big idiot he loves so much managed to stumble and twist his ankle and is just sitting there, waiting for someone to come save him. Or he was trying to build a robot to carry him back to the house out of the mailbox. Steve decides he is not trained for dealing with Tony Stark and wonders how he hasn't lost his mind.

It's then that he sees Tony's phone lying on the ground. When he gets closer, he notices blood. Not just drops; a small pool is a foot or so from the phone. From there, Steve sees the drag marks from Tony's feet, the tire tracks and skid marks from the getaway car… the text Tony was sending to him before this happened.

Walking to get the mail. Miss you alrea

This, Steve decided, he was trained for.