Part 1, Part 2, Part 3, Part 4, Part 5
Chevreuse Outruns Bullet[]


Chevreuse height (1.829/246*242)=1.799
Distance between Chevreuse and murderer (1.799/216*126)=1.049m

Flintlock mostly fire off round ball .45 in or 0.0114m
Assume that Cheversuse started moving once screen cut her off.
The bullet went pass her so I'll take the distance between Cheversuse and the bullet.
0.0114*1,080/(57*2*tan(70/2))=0.228m
Distance between murderer and the bullet (1.049-0.228)=0.821m
Flintlock fired between 305-610m/s (457.5m/s)
0.821/457.5=0.00179 seconds
Take that same timing and use it on the distance between Chevreuse and murderer.
1.049/0.00179/343=Mach 1.708 (Supersonic)
Kazuha Saves The Traveler[]
Stairs length (1.7/503*247)=0.835m
Distance between Kazuha and Raiden (0.835/13*543)=34.877m
Raiden moves her arm around 90 degree or 0.913m
Average sword swing is 20m/s
34.877*20/0.913/343=Mach 2.227 (Supersonic)
All Devouring Narwhal Survive Teyvat Being Destroyed[]

Neuvillette stated that the all-devouring narwhal has consumed so much primordial sea that if the entire Teyvat were to be destroyed, it would survive and swim off to another world. Mona also stated that the prophecy which is the Narwhal is a threat to whole Teyvat.

I'll be using the explosion method
The distance from east to west of Teyvat (100,000/81*(1441+551))=2,459,259.259m
1,229,629.629^3*((27136*1.378+8649)^(1/2)/13568-93/13568)^2/1e12=149.272 Teratons (Large Country Level 6-B)