"I'm an engineer, not a theoretical physicist or philosopher." He dealt with practical things where the rules made sense. Time travel made his head hurt, even if he was a direct result of it. Without his parents being time travelers he and his siblings literally would not exist.
"You're hurt!" he took hold of her hand to get a good look at it. "You're lucky there's no poisonous plants in this section. If you were in the Pandoran atmosphere section there are plants that could kill you."