It is not a DC surge as many people think. Lightning usually takes the form of a pulse that has a rise time of about 2 microseconds and a decay time of between 10 to 45 microseconds. An average strike is three to four strokes. Any bend or coil in the ground system adds inductance. For this reason, any run to ground must be as straight and free of bends as possible.
Gentle bends are preferred to right-angle bends.
If you remember that only an AC waveform can cause induction, we then are dealing with the phenomena of EMP or Electro-Magnetic Pulse. Having multiple places where these items go to ground leads to a condition known as a ground loop. Each ground point in a multi point ground will have its own resistance and inductance. This leads to different voltage levels and currents seeking to go to ground. Lightning seeking the easiest path to ground will flow around these various ground paths until it finds the best path for itself.