If Tony wasn't very aware of not only how easily the bot could kill him if he tried let alone how eager he was to make the attempts, he would actually be laughing at how he can't work a shrubbery. Luckily Tony's smart enough to know not to give him more reasons to want to kill him so just chooses to look kinda smug instead.

His eyebrows do knit together when Ultron claims Tony had taken everything away from him, not that he has long to make that face as the rock hits him in the forehead and has him clinging to his forehead as he takes several pained steps back.

"Really!?" He exclaims before looking back at him. "What did I do? Take your charger? Change your WiFi password? I have no idea who you even are. Look I know I've made some bad choices in my life and ruined other peoples lives because of them. But this is some hell of a variation on the pronoun game you're playing with me here."

As he speaks Tony contemplates backing out of the little garden, but quickly discards the idea because getting out of it means it's easier for Ultron to just go around it to get to him, deciding that he'll escape the garden bed once Ultron makes his way into it.

But there's still a moment while he thinks that has him so curious and almost irritated that he hasn't gotten too much of a straight answer from his wannabe killer.