[RichC]

I have had different experiences.

Usually, I have a similar sensation to that on Call of Duty when a stun grenade goes off i.e. A white flash and a ringing high pitched sound in my ears.

A couple of times though everything has flashed luminous green. If any of you can remember old cameras that used to have films (i.e. negatives), my vision looked as though I was viewing my opponent through a luminous green negative.