Of course the mechanics were a headache. Time travel itself was a headache. Mind, he hadn't properly invented it yet here in this time. But that didn't mean he hadn't been thinking about it a lot. He knew someone who travelled it frequently now, had had time to ask questions, to get measured and frenetic responses both.
It didn't matter right now though. Tony sighed, like he'd been afraid that was going to be her answer. He glanced up, and of course there was nothing but the same as there was left and right and he knew no matter what direction she'd come from, that space city wasn't going to be there now.
Was this his fault, somehow? He had brought here here, ripping her away from her personal, important quest? Tony wasn't sure, didn't want to think about it too closely, not yet.
"This place, I don't know where this is. I'd just wandered in, actually. It's my --" birthday. He'd been overwhelmed. It didn't matter. "There's a door," he said, a little helplessly. "In a house full of them. And they all lead somewhere new. But home base is a town literally in the middle of nowhere." He laughed a little, not necessarily humored, but because it felt so stupid to explain. "They - we - call it Starklandia."