So I was sitting in my room with my bearded dragon Bindi and for the first time she arm waved to me! Then when I went downstairs my brother went in there and she hissed at him and she never does that ever??? Why would she act so weird?
Arm waving is a submissive behavior, while hissing is defensive.
How old is your beardie? Typically juvies would start the arm waving, hissing, head bobbing, and black bearding when they're testing their dominance in the family.