If the beneficiary of an employees' disability pension has worsen the severity of their disability or hindered the recovery thereof, intentionally, through gross negligence, or due to a failure to comply with medical instructions that is without reasonable grounds, it is permissible not to effect the revision under the provisions of Article 52 paragraph (1); and it is permissible to consider the degree of severity of that person's disability to be classified as a lower disability grade than the disability grade it is actually classified as in effecting a revision under that paragraph.