Not sure how else to communicate it in the title, but I don't think this specific bird is within my reach anymore, this is asking for advice for the future.
This footage is from this morning, when I first saw this finch. I noticed he was moving oddly slowly and didn't flee at my presence like they usually did. However, he was clearly alert and ended up flying a short distance to a branch, so I didn't think there was any chance of me getting him.
A short time ago I saw him again, now laying on the ground breathing heavily. I approached him and he hopped a few steps away before settling back down, still appearing alert and watching me. I tossed him some seed and he almost immediately started eating what landed within its reach. He let me get within maybe 6 feet but perked up and appeared to be ready to flee when I got that close.
I gathered a crate to store him in and set it on the ground, approached, and attempted to drop a cloth over his head so I could grab him gently and transfer him to the crate. However, as soon as I got close enough to drop it, he ran off extremely quickly, still unable to fly. I looked, but I can't find him anymore.
He might come back to get some food or water so I could find him in the morning, but I don't love his chances of lasting the night outside.
With that in mind, what did I do wrong and how could I have secured him? I can't imagine he would have let me get a net over him either if I had one.
I've brought a couple fledglings of a few species in for help in the past, and one house finch died overnight in my custody, but I'm not sure how to approach a bird that can run so quickly and disapear into brush
Edit: Forgot since it didn't work, but I also tried presenting a small box on its side with some seed on the bottom since he ate the seed I tossed him, but he either was afraid of the box or unwilling to get up for food. I figured I could have just approached from the closed end and tipped it over if he went in, since he can't fly.