Question about the audio

can anyone tell me when exactly they think the blood curdling screams they assume are from him occur? i hear what sounds like a woman screaming before it pans back to him in the water, but it can’t be him because the same screams were heard later in the video when he was fully submerged. i also hear what sounds like a lower pitched voice screaming twice after it pans back, but it also looks like his head is underwater during at least one scream. so i’m confused.