Starbonds are the average of the last 5 movies for that star. When a movie they're in delists, the takings for that movie become part of their average and their 6th most recent movie drops off. If the new movie's a smash, the bond will generally go up. If it's not it'll generally go down, especially if the movie dropping off was a hit.
Two examples to look at are BPULL and EROTH. BPULL's 6th most recent movie was SCAR4 which is getting replaced by SURVL. Guess where his stock is heading. EROTH on the other hand is having his 5th movie coming on (BSTRD) and it's gross is going to make his average go up. What you want to look at is roughly what it'll make this average and if it's above or below the current price. Then you can decide to go short or long.
If you want it really easy, try http://www.the-numbers.com/hsx/Ā and the Daily ROI column.