If exactly half or more of a person's body is wounded or injured, what is the required method of purification?

Dry Ablution (التيمم): Pillars, Sunnahs, & Water Search Rules

• They must wash the healthy parts and perform Tayammum for the wounded parts.
• They must perform Tayammum only as a complete substitute for the bath.
• They must perform Ghusl with freezing water.
• They are excused from all purification and can pray directly.