Would a dragonfly around the size of a Meganeura be a concrete danger for a humanoid about a meter (3'3") tall, weighing around 15kg (33lb)?
This dragonfly wouldn't have particular evolutionary adaptations to be able to predate large animals, being basically just scaled up to have a wingspan of approximately 70cm (27").
The humanoids, on the other hand, are somewhat frail, possessing long and thin bones. They don't have massive anatomical differences from humans, except for some differences in the respiratory system, being closer to a bird's, and, obviously, their stature.
My question is whether or not this insect would be considerably dangerous and perhaps kill or severely hurt these humanoids.