I need to implement a very basic challenge that runs as follows:

1. Player A issues a challenge to Player B

2. If Player B responds to the challenge within 30 seconds he immediately wins the challenge.

3. If Player B fails to respond within 30 seconds Player A wins the challenge.

Step 1 is obviously straight forward. My idea for step 2 is to bind cloud code to the AcceptChallengeRequest and immediately call winChallenge with Player B.

I'm unsure what the best way to go about implementing step 3 is.  I am aware that I can set an expiry time when logging a CreateChallengeRequest, but I can't see a way of running cloud code when the challenge expires in order to call winChallenge with Player A. I could probably use the scheduler to log an event after 30 seconds but would rather use a built in challenge mechanic if there is one that fits my needs.

Any suggestions?

Thanks in advance!