We see shark swimming in the ocean. His tail swaying back and forth at a normal speed. The AE will have to focus on the normal pace of a shark swimming and the shark's mannerisms as he glides through the water.
The shark's speed begins to pick up as he notices something in front of him. The AE will have to focus on the increase speed of the shark. The hard part is to keep it realistic. The increased speed needs to be noticeable but not overdone.
We see the shark catching up to what he is chasing, a sea lion. In this clip, the AE will need to focus on the speed and mannerisms of the sea lion. The AE will also have to focus the shark's mannerisms as he catches up to the sea lion.
The sea lion is trying to escape the shark. The shark is in attack mode. Sharks attack by swimming up and jumping out of the water to grab their prey. The AE needs to focus on how the shark does this action (the specific movements). AE needs to focus on how the shark pushes upwards.
The shark has captured the sea lion and is returning back to the ocean. The AE needs to focus on the decent downwards, how the shark moves as he is returning to the water. The angles, speed, and specific movements are important here.
The shark returns to swimming normally, at a normal speed. The AE needs to focus on the movements of the tail, and how the shark glides through the water.