the label refers to the whole, not to that side. There is a shoulder pad, a trigger for the main arm, and a handle for the second hand. Should be obvious from where it shoots.
What? The launcher is shoulder mounted, and the ventilation slots would be facing upwards. IMO it looks sleek, powerful and functional. I love the art-style too, they stuck to simplicity, and it doesn't look as ridiculous as UT3 weapons.