A person whose violation of sections 18-802, 18-803 or 18-804, Idaho Code, results, directly or indirectly, in great bodily harm, permanent disability, permanent disfigurement or death of a firefighter or any other person, regardless of intent or lack of intent to cause such harm, upon a finding of guilt thereon shall be sentenced to an extended term of imprisonment. The extended term of imprisonment shall be computed by increasing the sentence imposed for a conviction under such sections, by a period of not more than ten (10) years.