Keep Coding

Activity Diagram for Simple Pacman-like Game
When 20 seconds passes, the player unlocks poison. Poison can be dropped to slow down the enemy, or the player can accidentally eat his own poison and slow down.
I want to show that the player wins after 60 seconds has passed. I thought I would show it as a loop looping the 20seconds 3 times but that would be incorrect because the player can only unlock the poison once.
Would the best way of showing this be to draw a rectangle around the entire diagram and just state (after 60 seconds, player wins)? - and have it lead to an end circle?

You can also just add the point where you get start time and add point when you check if current time - start time == 60sec.