Have you ever dealt with colic in horses?

I've had 5 horses now, and 3 times have experienced colic with my own horses. I have also experienced it with other people who board their horses at our farm. One colicked for an unknown reason, about a month after we brought him home. We walked him for 20 minutes, and gave him a shot of bute to relax him. He was fine within the hour and starting acting like his normal self again. My old horse that I have had for 7yrs colicked for the first time, and I was around him so I noticed the symptoms (light sweating, nipping at his stomach, and threatening to lie down) right away. I got him walking and gave him mineral oil right away. He got better quick. The other time was the first time I had ever experienced colic, with my then 24yr old QH/Arab named Dancer. My grandfather (worked with horses for 50+ yrs at the time) and my Dad said that my little guy would be fine, and we proceeded walking him. After about 30mins. it was apparent he was not getting better, if anything he was getting worse. He was beginning to pull on the lunge line, and tried to lie down even with my dad flicking the lunge whip to get him up. He had been turned out on dewy grass before leaving for school, which we were assured would be fine, since all the racehorses on the farm had never had a problem being out early on dewy grass, so we figured he'd be all good. When the vet finally came out (2hrs after colic was noticed), Dancer was lethargic. The vet took one look at him and said in his normal grumpy character to put him down right then in there. We refused, and he went on with the checkup. We wanted to see if there was a way to save my pony first. The vet went through the motions, listening to gut sounds, and sticking his arm in him to feel for impactions. There was none of either, and the vet attending determined he must have a twisted gut, with the only way to help him being surgery that would cost $10 000. When he asked how old he was (because we wanted to proceed, no matter the cost) and we told him that he was 24, he gave him a 40% chance of survival if he went through with the surgery. My mom took me to the house, and went back to the barn to discuss what they were going to do with my dad. In the end, they decided to put him down, and they didn't want me to be there. I couldn't see him afterward, either, as they buried him the next day without allowing me out of the house. :(

Another mare (not owned by me, but a boarder) colicked a total of three times in less than a month and a half. This (we figured) was due to her owner not turning her outside enough (he had not turned her out for weeks before the first colic, and up until the last colic. Guy is a complete quack). I walked her all three times while one of my parents ran off to call the owner, or (if they could not get a hold of him due to no minutes on his phone!) go to his house to get him. One time the mare had such shooting pain that she kept shooting foreward and rearing. She almost landed on top of me.

Have you ever experienced a stressful colic with a horse you own/ know? Has any of them ever died from colic?

I know I miss my little boy Dancer everyday. He died in October 2008. RIP boy.