Sideline throws aren't "progressed" to. They are somewhat quick hitters once the receiver hits the top of their route and breaks back. Point and case is the pick six; Ramart instantly went to that guy, staring him down in the process. Typically if a sideline throw is broken, there is not a progression, but rather a throw away over the receiver's head and out of bounds. Now, if he read the defense prior to the snap and saw that the sideline route was going to be the best option, to your point that is on Ramart. However, I would still argue in favor of making it simpler on Ramart, and not putting him through those types of decisions in that situation.
My point is it's one of the most difficult throws a QB has to make, and should not have been called - especially as often - as it was tonight once Ramart came in. Instead, they should have stuck with the slants over the middle like they did on the touchdown throw, or screens.