Help with removing board

[morta]

I need some serious help. Iv got to return my board and I can't seem to remove it. There is one screw stuck in the board that I can't remove. What tool do I need to remove this thing? Please provide links so I can buy the tool. I need this out asap!https://ibb.co/Mk2gNLf

 

[morta]

a picture tells a thousand words

Stupid ******* phone. I did upload a picture is it not in the link I provided?

 

[morta]

My guess is the standoff is turning with the screw?

looked at the picture, wtf was the motherboard pushed through the standoff? (and that looks like a extra long one)

I dunno. It was ages since I built it and i don't remember why that thing is there instead of a screw like all the others. I just need to know what tool I need to remove it with. It looks like an Alan key but I dunno what type as its a cylender type shape. And there is no screw on it that a screwdriver can remove. Anything from amazon? I'm desperate and I can't return this until its out of the case.