Feat from episode 4 of Puella Magi Madoka Magica. Link here.
At 20:24 Sayaka hits Elly and makes a sonic boom, and they keep travelling trough the labyrinth until 20:26.
Assuming that Sayaka was going as Mach 1, timeframe is 2 seconds, so 343x2=686 m.
Elly created the labyrinth, so MCB Elly?
Darkanine's versions[]
Sonic Booms are 332 m/s.
332 * 2 = 664 m
We typically use the explosion formula to get a tier for these things.
R = Y^(1/3)*0.28
R = Radius in km
0.664 = Y^(1/3)*0.28
Y = 13.33614 Kilotons
13.33614 / 2 = 6.66 kilotons or 2,786544 x 10^13 J
So Town level