Arthur Pendragon is a woman

The thing is ,Merlin drinking that poison and Arthur riding out to get him the antidote have absolutely 𝘯𝘰𝘵𝘩𝘪𝘯𝘨 to do with how they feel about each other. It doesn't have anything to do with Merlin's Destiny even. I'd say they weren't even friends yet at this point.

It's about doing the 𝘳𝘪𝘨𝘩𝘵 𝘵𝘩𝘪𝘯𝘨. Like Morgana ends up saying "Sometimes you gotta do what you think is right and damn the consequences" that's the whole message of the episode.

Merlin would have drank that poison if it had been Morgana who was in danger. Hell he would have probably drank it if it had been 𝘜𝘵𝘩𝘦𝘳(undeserving of that as he is) because for him, that was the right thing to do. Because that's simply who 𝘩𝘦 𝘪𝘴.

Similarly, Arthur would defied his father's orders and risked his life and begged if it had been 𝘎𝘸𝘦𝘯 who drank that poison(and who felt nothing for at this point) or if it had been some random servant he had never interacted with before because that was the right thing to do. and it shows us a glimpse of his potential. Someone willing to risk it all for what he believes is right. Someone that values his people and takes the responsibility of protecting them seriously.

I don't see why it's this big merthur evidence because the way I see it, both Merlin and Arthur would have done the same thing for anyone else. They don't mean much personally to the other at this point.