Okiokdey, good question as we have not used reflex attacks yet. Basically this means you get an attack on him right now- which you have described- which he as to defend against at the same as you defend against his.
I am going to assume your reaction was 'defend'- but you do have to specify your reaction as well as your reflex attack. Mind you, I must owrk on that particular kick reflex power because it was hastily adapted- it will stand as it is for now.
You don't need any focus other than the basic cost.
Grim did not time his shot well and your block succeeds easily. He decides to (Dodge) your riposte taking his defensive skill to 8- however, a +3 on your roll gives you a total of 8 as well, and a hit for two points of damage as you land a sligh but solid blow. Nice riposte!
Now it is your move, Rade.
Ok,. Burn, distance?