You're are driving a truck full of your stoner friends. The car in front of you slams on its breaks and all of your wasted friends are screaming that they are going to die.
You scream "I GOT THIS!!!" and then you stop your car just inches away from the car's bumper.
You are going to watch out and be a second set of eyes for someone. You will look out for their best interests and let them know if they have missed something. You will stick up for them.
Dbyrn: Hey, Frappe, I saw some kids messing around near your car, looked like they might be think about breaking in.
Frappe: Dude, seriously?
Dbryn: Yeah, I took some pix of them with my cell phone and they saw me and split really quick.
Frappe: Thanks Dude!
Dbryn: Don't worry, you know I've got your back.
The complete, sudden onset of the cessation of brain activity, brought under the presence of acute stress, which fully affects the person only a short time after it strikes them. Said person, under the duress of the symptoms, demonstrate their affliction by alerting to others that they can't even, in reference to their inability to deal with the symptoms, or their inability to perform simple actions which have been made impossible by their afflictions.
"I can't even- (breath, talk, think, feel my body, etc.)"