You have mentioned that an employee slipped and suffered serious injuries, but you have not clarified whether the employee is covered by ESIC (salary up to Rs. 15,000/-) or not covered by ESIC (salary is more than Rs. 15,000).
ESIC Coverage
If the employee is covered by ESIC, ESIC will make the payment of the salary if ESIC prescribes leave.
Non-ESIC Coverage
If the employee is not covered by ESIC, it is the decision of management whether they want to give him paid leave or not, or want to adjust his leave (such as Sick Leave or Privilege Leave). In reality, these days will be adjusted from Sick Leave or, if insufficient, from Privilege Leave.
Regards,
Rajiv Singh