"Right" Dennis nodded, backing up what Frank said, "It only hurts initially, and even then not much" he added, seeing the little Corythosaurus about to flinch.
"Here, I'll even prove it on whatever brave soul feel up to going first" Dennis added, upping the challenge a bit to get a response, which he got. "Well I'm not afraid of anything!" Cera declared, striding forward.
Triceratops…yes that would do nicely, Dennis thought. As he knelt to deal with Cera, he conspicuously pulled two vials he happened to have with him yet kept one hidden within his palm as he stuck Cera and drew some blood into each, slipping the second vial away and standing with the one.
"And there it is!" Dennis declared, showing them. Kit flinched and frowned, "Y-yeah I've seen that stuff when folks are attacked, but...why is it a good thing" she wondered.
"'cause, it'll tell us if you're sick or not" Dennis told one reason, "and we can see if you could stand being up there and all, like I said".
"It tells all that?!" Cera asked. "With proper machinery, yeah". Dennis was about to point out how it was even such simple stuff like this that allowed them to bring the dinosaurs back to even be talking to them now…but he felt that might be saying too much given his current plan.
~~~~
"Oh, right" Peter said, "So how should we go about that anyway? Catching a Rex I mean".