User blog comment:The Milkman/The Writing of the Ending/@comment-903543-20120531040823/@comment-4835791-20120531202623

I think I can answer your question about the relays¡ explosion. In arrival it destroys an entire sistem because of the way it xplodes. A Collision and the subsequent uncontrolled chain reaction. In ME3 you don't throw an asteroid into a relay, you use a device (the crucible) made on purpose to alter the relay network in a somewhat controlled way (although it depends of your ems wich makes no sense).