What time was it when you got caught in the security line? There are 3-4 other TSA entrances open in Terminal E at any time. You could try the next two closest checkpoints at DL or, personally, I'd use the one by CO/NW. The “Low E” Skylink stop is right there. I'd take Skylink one stop up to “High E” and then you'd only be a few steps from the US gates. Good luck.