Huffing and chomping = full charge or false charge ??
Apparently such behaviors are not indicative of intent to harm and so would indicate the charge to most likely be a false charge. False bear chages include charging and then reversing direction and also charging past what they were charging and often continuing away.
Huffing and chomping are indicative of the bear being scared.
or is being threatening (and likely scared)
...not considered threat behavior...
...used with a false charge to help keep from being attacked...
...more about not being a real threat and/or being scared