Heres the code for the animation
local biteanim = Instance.new("Animation")
biteanim.AnimationId = "rbxassetid://5638379797"
local biteanimTrack = humanoid:LoadAnimation(biteanim)
and heres the code when I play it in the function
biteanimTrack:Play()
wait(1)
biteanimTrack:Stop()
it plays once when the game starts and doesnt play again

3 comments
if it helps any, the function uses player:LoadCharacter() a few times
do you want it to loop? or do you want it to just play a few times
you can get animations to play?