Certainly you can lose a ball in a hazard, but under the rules is isn't a "lost ball" as covered in Rule 27. You still follow the procedure as laid out in Rule 26 for ball in hazard. Same as a ball that is unplayable in a hazard doesn't come under Rule 28, but again is covered by Rule 26. In the case of AK, if he did not find his ball after the stroke in the hazard, or found it unplayable still in the hazard, he can still proceed under Rule 26-1 and drop in one of the 3 places as described in that rule.