When the enemy is anchored, you hold the shot button and move your joystick/d-pad while your holding the anchor button. I find it much easier with the autospin on though as I couldn't get it to work well without it.
spongdangly wrote:When the enemy is anchored, you hold the shot button and move your joystick/d-pad while your holding the anchor button.
After that, quickly do a 180° motion from up to down. Your Trigger Heart should now perfom a full spin.
It might take a while to get used to it (sure did for me), but I find the bonus of using enemies as a static shield is worth it. Helps me a lot during second half of stage 4.