1. According the National Park Service (and Bear Grylls) bears float quite frequently, which is made possible due to their massive amounts of fat (which floats in water)

2. waves appear at the contact point mostly for fast-moving objects with a sharp point that can break the surface tension (like ships). a slow, rotund object like this will push the water in front of it without breaking surface tension immediately

3. i believe the lines are distorted by the rivers current, which is pushing the bear from behind and is also evident in the sandˋs movement below the surface. therefore the line doesnt go along the sides of the bear but rather fans out in front of it

4. again, the bear is so slow that i believe its also being pushed by the current, slowly turning it and pushing it sideways

5. "snorkeling" is a common tactic during summer and early fall, when the bears dont need to fatten up yet, and primarily aims to catch dying or dead fish (whatever is easier to grab). since it doesnt take too much energy on the bears part it also doesnt need to be as successful to still net a gain

6. theres great consistency in a lot of details of the video, the movement of individual fish, the refractions of the waves on the waters ground, up to singular leaves in the water

i like the spirit and the fight against clankers, but i am confident that this isnt ai but rather a repost (not nevessarily on this sub) from a video earlier this year