I don't use GameMaker, but I can tell you right off the bat your randomization isn't going to work. You're generating a number between 1 and 30, inclusive, and only if that random number is larger than 30 will it move towards obj_player. It will never reach that condition. Why not just do

Or replace "==" with proper GameMaker syntax if it's not correct. I don't know about the going in a corner part, though.