How do you create a "collect" objection that corresponds with the enemy behavior in C#?

In my game, the point of it is to collect 8 objects. Each time you collect something, it will notify you that you have collected it and how many are left. Once you get all 8, audio will play and the game ends 20 seconds after the audio has stopped because the enemy will catch you. In this, he will also catch you if (after 2 objects are collected) you move in right+left+right +180 or -180 order from wherever you turned on the second right.