I had a weird experience today. Flying in my type 7, and I got interdicted. Went through the routine, submit to interdiction, four pips to shields, deploy chaff, boost, select nearest star system and high wake out. I jumped out and got away with my shields still on two rings

, and had quite a nice adrenaline rush.
My destination was in the system that I'd just left though, so I had to return, which I did as soon as my shields were back up to three rings.
This time I got interdicted by a different guy in a cobra, submitted to interdiction, and my ship went spinning hugely wildly out of control. four pips, deploy chaff, this time I thought I'd launch a couple of mines to see what he did. What he did was kill me. In the space it took me to drop a pair of mines (two launchers), this cobra took my shields down from full (and on four pips) and blew my ship up.
Two questions that arise from this are;
Do cobras frequently three-shot-kill type 7 freighters? and the second of which is,
What is the point of having mine launchers to cover you as you run away, if to deploy mines you have to stop running away?
It's been an interesting day.