Is the click sound similar to the sound of snapping your fingers? If so, Maalik and I like to make that sound back and forth to each other. For us it's a fun game. Never knew it also meant to stay away.
Alfie used to sucker punch me by lowering his head, waiting for a scritch then then lunging. So I'm always a bit cautious and if he flicks his head to one side, I back off immediately. If he steps forward and lowers his head again then he definitely wants a scritch. If he doesn't move then I feel it's a 50/50 of whether he wanted a scritch or was going to bite. 🤣