Marina fumbles with a magic dust bag and manages to throw some at Halvarth. As Marina throws the dust, she drops the bag to the ground and runs to Ridley's side. When she reaches Ridley, and Halvarth is getting up again, the magic dust bag is with her again.
The portal Damodar uses to return the Staff to Profion links to a point behind the mages. When Ridley exits a portal at the same location, he is standing somewhere entirely different, but the portals can be independent.
At the entrance to the dungeon, Elwood is obviously pulled back by a cable when he touches the Wall Of Force. His waist bends and flies back faster than the rest of him, even though his whole body hit the wall at once.