The diver was producing quite a cloud of bibbles from the first time we saw her. She may have already been maintaining her depth by swimming forward and waving her arms for some time. When she starts to fight for the surface, she might get to the point where she is breathing harder than a reg can supply gas (so-called overbreathing the reg), that sensation might easily inspire a diver to toss the reg.
You need to watch and stop that hand-waving as soon as it starts; sometimes the diver is actually OK for the depth when horizontal, but poorly trimmed and waving their hands to keep from going nose-down. I've esp seep big floaty fins over floaty wetsuit booties causing this.
I've read that the "climbing an invisible ladder" movement she shows is classic for someone beginning to drown and loose control.
You need to watch and stop that hand-waving as soon as it starts; sometimes the diver is actually OK for the depth when horizontal, but poorly trimmed and waving their hands to keep from going nose-down. I've esp seep big floaty fins over floaty wetsuit booties causing this.
I've read that the "climbing an invisible ladder" movement she shows is classic for someone beginning to drown and loose control.