heres what i think happend. the guy filming didnt get the hint the snake didn't want him so close and the guy kept harassing it till it slitherd into the pond, but it couldnt get out of the pond as easy with the frog head sticking out of its mouth. And the snake started to sufficate because the breathing tube was now in the water so it let the frog go alitte to breath and continued to swim but another frog it look like jumped on it by coincidence. and bam the frog is gone.