A nice mental drill is to get into tight spots per say and learn to work with them. for example: you kicked high and your leg was cought what do you do ? hit the hand that is holding your leg, do a scissor leg move, roll towards the leg, let him have the shoe as you get out of the grip ? kick the shin of his leg, grab his shirt or neck and use that as a counter lever and so on. next try working with a neck strangulation, two people on top of you (not the supermodel type, they have sharp bones and need protective gear ) and the list goes on as far as you like. Situational spots are also good. For example one person acts the bully in a staircase or someone comes in and tries to steal your case as you are sitting on a bench. One person distracts you with an “honest question” as the other makes a grab at your child and so on. Remember to breath and keep moving. you will not always succeed but you can survive if you keep trying.