This happened to me this weekend, and gave me quite the scare. It turned out okay, with only a couple of scratches on my gelding, and about 3.5 years off my life.
My stalls have interior sliding doors that open to the aisle, and exterior dutch doors to the dry lot. Exterior doors are latched open pretty much 24/7 for free choice inside/outside access. My gelding likes his after dinner nap, and always naps inside. Thankfully, for the first time in a couple weeks, I had my windows open when I heard some banging. I thought it was my dog trying to hide in a closet upstairs (fireworks) and went to check. He wasn’t there and instead I found my cats sitting at the open window, staring out at the barn. That’s never a good sign, so I went to check. I found my gelding cast with his legs on the side of the stall where the aisle door is. I don’t know if he laid down to nap too close or decided to roll and got stuck or what, but he gave me a look like “a little help please”. Since I was alone, I didn’t know what I should do first: try to help him on my own, call the fire department, or possibly the one “neighbor” at the beginning of my private road who knows horses. I don’t know his phone number, and he’s battling cancer, and I don’t really know him too well so I opted for number one first. I was able to get the aisle door open, a lead rope around a hind pastern and get him to shift enough to get some space to finally gain some leverage and get up. He’s thankfully pretty calm and not one to panic.
I realize I’ve only seen a cast horse once, when I was a little kid, and was therefore shuffled out of the way for the adults to deal. I hope to never see it again, but I’m wondering what the general consensus is for other people when you have this situation and are alone.