The movie is visually beautiful and tense, but it takes as much care about laws of physics as Harry Potter serial does. To avoid spoilers, I won't be too specific, but watching the movie reader will understand. Rule of thumb (avoiding technicalities) - to maintain stable orbit on certain altitude object needs to have specific (angular) speed relative to the center of the earth. For example ISS performs DAP (avoidance procedures) -moving significantly up or down by increasing or decreasing speed by 1m/s. Therefore, when increasing speed object will move in higher orbit, decreasing speed it will move to lower orbit. Aiming at space station from 100 miles distance and then accelerating significantly in its direction wouldn't bring you anywhere near it. If the orbits were perfectly aligned, one would end up few miles above of below it. Disregarding that, approaching station with speed difference of, let's guess 30m/s, isn't good idea. If aimed correctly, astronaut would end up as fly on windshield, with or without auxiliary source of thrust. Cloud of debris, due to earlier mentioned rule, can't return on the same "place" unless orbits were perfectly aligned in opposite direction. Besides, If speed of debris differs from target, they would move to different orbit. Just to mention that Hubble orbits almost 100 miles above ISS with different inclination. Moving between those two orbits is very complex task requiring quite lot of calculation Still, after accepting Harry Potter as reality standard, I like the movie.