The ship's sensors also registered that none of their previous shots were having any effects, yet the enemy ship was then destroyed by one torpedo at the end.
So?
So their sensors were fooled by the Douwd in the case of the ship's resistance, twice.
However, the damage to the E-D, including the collapse of the shields, would have been registered by internal sensors, rather than being a Douwd creation. Those sensors registered a 400 GW hit, which knocked out the shields.
Makes sense, especially when you factor in the very real injuries suffered by the crew, which were not Douwd induced.
I went over the numbers for fun.
A 1 Watt= 1 Joule / 1 second.
If the 400GW is kinetic energy, then it is most likely "Translational kinetic Energy", because the ship rocks when it is hit.
If so, then here goes:
400GW = 400 000 000 000
billion Watts.
If this is delivered in 1 second (which we'll assume for this calculation), then we're faced with 400GJ.
How fast would a 1000kg car need to go to have that kind of energy?
Let's see.
"Translational kinetic Energy"'s formula is as follows:
K.E. (kinetic energy) in joules = (m.v*v)/2, where "m" is the mass in kg, and "v" is the speed in meters/second.
v*v means "v" squared.
So, we have 400GJ = (1000 . v*v) / 2
That gives us 400GJ x 2 = (1000.v*v)
800GJ / 1000 = v*v m/s
The square root of 0.8G, or the square root of 800 000 000 = 28 284.3 m/s, or 101 823.48 km/h.
So 400GW is like being hit by a 1000kg car shot at 101 823.48 km/h.