There are a lot of things you can do in arenas to become a better player. One of them is pet management. Sometimes people will completly ignore your pet. Sometimes, they try to gank it, then gank you. Most of the time, this is done by either a rogue or a warrior.
If you encounter this situation, what do you do?
Well, if you are facing a two dps team especially, use fel domination to resummon a Void Walker. The Void Walker sucks for PvP for the most part, but there are a few advantages to this method. My voidwalker has over 10k health and a bunch of armor. This will make it much more difficult to get rid of your Soul Link. Time they spend on your VW is precious time that you will be beating on them.
If they do decide that the want to kill your Blueberry, you can sacrafice it for a nice bit of damage mitigation at the last second. Bringing in the blueberry instead of another felhhunter can be the difference between life and death against a well geared Warrior or Rogue.
Another good tip is to learn how to fake cast. There is an in depth article about this by Horns at Yet Another Warlock Nerf http://www.locksucks.com/.
In general, these should be the only two pets you ever use in an arena. The Succubus CC is nice...except that most classes can two shot her. The imp just plain sucks. The Felguard is a very nice option, but then you arent an SL/SL lock if you have a Felguard out now are you?