A Scrambled EWP'er can have their poo hit their allies. I'm not sure of the exact mechanics though. I'm not sure if the Scramble needs to be placed before EWP activation or during it; all I know is that I've gotten snagged on ally's poo before.
Even if so, it's very unlikely they'd get trapped in their own Theta cloud unless they backed into it. Only a cruiser would go full reverse+evasive maneuvers while engaging EWP if he's got a target on his tail.