In the hour prior to this photo:
"Just let me finish this beer and I'll be ready to go with you."
"Someone's using the bathroom. I'll hold it 'til I get home."
"There's no rest room in this station?"
"How much longer before the train comes?"
"Signal problem? How long is that gonna take to fix?"
It looks like he was sitting down when it started, and by the time he got up and stumbled to the planter it was far too late! Probably sitting on a bench drinking with friends and holding it in so he wouldn't miss out on the conversation.