I agree with the others. Even if the owner did happen to know of a laminitis issue, it is next to impossible to prove in a court of law. And it's highly possible he had no idea. It's hard to judge a person's tone through email.
If I sold a healthy horse, and the owner came back to me seven days later saying it had foundered, I would not take the horse back. You can't control when a horse gets sick of hurt or what.
My mothers horse has laminitis and she just needs some special care (Heiro supplement every day, bute for flare ups, special shoeing and X-rays with the farrier, etc). But she is a great horse and worth it.
Nurse the horse back to health and then if you still don't want her, sell her to someone willing to take care if her needs.
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