I'm assuming whoever shouts first.
I'd be interested to see more than one image in response to a poem, and more than one poem in response to an image. One way to do that without branching would be like this:
Sarah-Jane has baggsed the image, which means the next poem will be written in repsonse to her image. However, anyone who wants to can also produce an image in response to Jayne's poem.
Next, someone bags the role of responder to Sarah-Jane's image, but anyone else can write a poem.
And so on.
-Matt
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