Hognose strike with a closed mouth, it is more of a pecking action. Mine will peck me if I let it but it has never tried to chew on me.
There is a youtube video of a guy that allowed his hognose to actually chew on him to see the effects. They are rear fangs and actually require some work to use them. Thats what I see feeding mine live, she still refuses f/t.
Google hognose bites to see pics. It can cause swelling, pain, nausea. With any snake you can get bit but my hoggy has never struck while being held. She only does it when she is pissy and im working in her tank. Without messing with her tank I can just pick her up without drama.