What was the urine joke all about?

I read this comic about Team Fortress 2, but I did not get the joke. What was in the bottle? Urine? if so, what's the point of the last panel? why is the spy consoling the sniper?

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2 Answers

The piss is red/brown, which means the sniper is either pissing blood or he has stool in his urine, which both means he's quite sick/dying, hence the consoling.

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The bottle is the snipers jarate throwing weapon, which contains his urine.

Since it's red, he might have a severe illness.