Conversion of auditor from proprietor to llp

Form ADT 3 is for resignation. Firstly,  auditor will resign then company will file for ADT 1.

Step1 : ADT - 3 is to be filed by the Auditor of the at the time of resignation with in 30 days. If the auditor fails to inform the ROC about the resignation then there may be penalty of Rs. 50,000/- to 5 lacs.

Step 2 : ADT 1 if files when company appoint LLP as an auditor after conversion.

My Query --> If he resign from company his tenure (which may be less than or equal to 5 years) will be over. So how he can continue as Auditor of that company indirectly by converting into LLP (Seperate Legal Entity).