To clarify, in case I misunderstood here are two possibilities, where you are the red dot and your opponent is the blue dot.
[attachment=154]pushexample1.jpg[/attachment]
When you cast Jet Stream, if you get a push, then you must bash them into the wall, because that is the opposite direction of the caster, you.
[attachment=155]pushexample2.jpg[/attachment]
When you cast Jet Stream here, you have two options. You may either bash them into the wall, or move them to where the green dot is. But those are your only two options as they are the only two directions that would move your opponent farther away from you.