This is an
air burst
- The source of the explosion is the ghost-bear monster, which is clearly floating above the ground.
- An explosion is considered a ground burst when it detonates on or very near the surface, causing the blast to be shaped into a hemisphere and create a crater.
- Since this one originates in the air and expands spherically (as shown by the flash), you use the air explosion formula. The fact that it's close to the ground doesn't change that unless the initial blast wave is directly interacting with and being shaped by the ground. Here, it isn't
There are two ways to handle this:
Method A: Trial and Error
This is the simplest way. You have to guess the yield and plug it into the calculator until the "Air blast radius (near total fatalities)" value matches the radius you measured from the feat.
1. First, you'd need to scale the size of the room and get a radius for that explosion flash in meters.
2. Then you go to the calculator and start plugging in values. Let's say your radius is 5 meters. You'd input "0.001 kilotons" and check the radius. Too small? Try "0.002 kilotons." Too big? Try "0.0015 kilotons." You keep adjusting until the output matches your measurement.
Method B: Using the Formula Directly
The VSBW page gives you the formula to calculate it directly, so you don't have to guess.
For an air burst, the formula is:
Y = ((x / 0.28)^3) / 1000
Where:
Y is the yield in Megatons of TNT
x is the radius of the explosion in kilometers.
Important Note: The wiki's methodology states that for a conventional (non-nuclear) explosion, only about 40-50% of the total energy goes into the blast wave. So after you get your result, you should double it to get the full Attack Potency value.
However,
This isn't a conventional explosion. The lab is completely untouched. There's no crater, no shrapnel, no sign of heat or pressure damage. The machinery, the cage, the pumpkins, everything is exactly as it was.
