Duan Jian vaporized an enemy and a good amount of ground with a fire-based attack, making this way a crater. I'm going to calculate the tons of TNT necessary to perform this feat.
We don't know Nie Li's height, so i'm going to use the average height for a 13 years old male teenager which is 156.2 cm according to this website.
Duan Jian's Height:
- Nie Li = 48 px= 156,2 cm
- Duan Jian= 65 px= 65*156,2/48= 211,5 cm = 2,115 m
Radius of the crater:
- Duan Jian= 34 px= 2,115
- Crater= 738 px
- Diameter= 738*2,115/34= 45,9 m
- Radius= 22,95 m
Depth of the crater:
- Nie Li= 35 px= 1,562 m
- Depth= 147 px
- Depth= 147*1,562/37= 6,2 m
I'm going to use the formula for the volume of an ellipsoid, used here.
Volume of an ellipsoid = (4*pi/3)ABC
V= (4*pi/3)*22,95*22,95*6,2= 13678,73 m^3= 13678730000 cm^3
The attack was based on fire and the foe touched by it has completely vanished, so it is surely a vaporization.
25700 *13678730000= 3.5154336e+14 joules= 84020.8797801 tons of TNT= 84.0208797801 kilotons of TNT (Town Level +)