The shield can be seen in the screenshot below in a post DSN2K made. The sword is on the other side. You can see the handle, hilt, and sheath on the other in a couple of frames before they jump off the horse. It is not the quiver. The quiver is on their back.
Here are some screenshots of the sword.
The light arrow is in front of the scabbard, it is held separately from the other arrows. You can tell based on the design of the head of the arrow that it is the one used at the end of the trailer.
You can see the sword again more clearly as the pull the single light magic arrow away.
You can see the handle of the sword right above the saddle at the bottom there.
To fight an enemy that is in the water, bow and arrow from a distance to reveal the weak point is a better choice.
Sorry for the bad quality screen shots, I'm on my phone and got them from the YouTube app.