I'm pretty sure my little dog would do something similar if she encountered a wild boar in the forest. I'm quite sure that if I were successfully chased down by a velociraptor, I would not just lay down and wait to be eaten.
> Researchers said the discovery challenged a long-held view of early mammals as “fodder” for dinosaurs.
I don't really get how that "challenges" any view at all. As if dinosaurs never got bitten nor scratched by stuff they were trying to eat. And with an erupting volcano nearby, I'd probably fight harder just for the hell of it and to mess with the palaeontologists.