Sorry when this was posted allready by someone, but have'nt looked for it.
When i in Kelp Forest kill one of this "Water Spiders" ( i name it so, cause they make some kind of net ), the Camera is following them, when they are falling down, after killing.
It's not so bad, but it could be, that some other Creature attacks in the 2-5 Seconds, and you don't see it.
So, if this is a wanted behavior, so ignore the post, when not, then you know it now.