First off, you don't have to put OOC in the Q&A.
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I sent out a bunch of PM before I disappeared and I think they were lost as more than one person is in the dark literally and figuratively. So what i thought was known to all was not.
The electrical is completed down on the ship and that means EMP. However, when Grace was rewiring the systems for Destiny back when you first found her, she took the time to shield the backup system from such an attack. She spend days on end in the access tubes wrapping the wiring with the protective shielding. So the back up will come on as soon as the system can reboot (5 minutes). That will give you life support, inner ship communications and emergency lights.
Grace also hid one battery completely shielded to connect to if you need to get one thing working (airlock, engine, transmitter, etc) for a short time.
So you will be in the dark for five minutes and the backup will come online. Emergency lights will activate. That is what the assilant has noticed and you would realize that if you are under attack (assumed) then anyone wit ha scanner will know you are not dead.
Tess/Celeste - Your console and flight controls are completely dead. First check of back up will come up as dead as well. But Tess knows in her heart of hearts that there is no way Grace wouldn't have built a contingency plan for something like this. So you would have that faith to draw upon for the five long minutes until the back up will sudden kick back to life (You either have the best mechanic alive or the twitchiest)
Jon/Ody - There was an EMP in that explosion. You know it. Why else would all the electrical including the back up die. But Jon knows in his gut that there is no way Grace wouldn't have built a contingency plan for something like this. So you would have that faith to draw upon for the five long minutes until the back up will sudden kick back to life. Jon would also know that Ken would head for the main airlock and defend.
Ken/RPN - You played him as exactly as I would suggested. Being newest to the ship you might not have the faith in Grace that others would have, and work on a "man alone" basis. In fact, the power being restored so quickly might surprise him.
Jason/Phelan -You were just making a connection to a friend of yours who might know something of the Tong interests when you find yourself on the ground. Jason would know the following. Grace will get the system working. She always has in the past and no matter what the crisis, Grace comes through. Ken will be arming himself and heading for the airlock. Stephanie will be running through the ship soon to check on everyone and see if they are wounded. She will not heed her own safety.
Hope this helps.