Angst please
My muse has poisoned themselves (accident or purposeful, up to the mun.) and become very ill while alone with your muse.
He'd gotten the measurements wrong. It was an alien fruit - deadly to humans so his temporary companion couldn't have any - and in too large of doses could make almost any species ill. It was a delayed reaction, though, not hitting until they were partway to the TARDIS. His whole body shook under his jacket, skin getting paler every second.
And then one of his legs gave out, sending him toppling to the ground.











