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Subterfuge might not have been Tony's strength, but he had been sure no one was following him, he had been watching all points, he was staying safe. So when he gave a start at the first syllable behind him he almost bit his own tongue off, his shoulder slamming into the wall as he spun around and hand flying to his chest, sure his hair was on end like a startled cat.
"Goddammit, Vizh, I have a heart condition, give a guy some warning," he hissed rapidly, then slumped against the wall, staring distantly at the far side of the hall while he regrouped and measured the erratic beating of his heart. It took a deep breath before it occurred to him to add, "What if I had been armed?" as though Tony with a heavy vase would have been any threat to the Vision. He might have left a dent.