What is the correct action for a person experiencing a severe asthma attack?

Assisting a person in using their inhaler and monitoring their breathing is the correct action during a severe asthma attack for several reasons. First, using the inhaler, which typically contains a bronchodilator, can help alleviate the airway constriction that is causing difficulty in breathing. This is a critical step because it directly addresses the immediate need for relief from the asthma symptoms.

Monitoring the person's breathing is also essential, as it allows the responder to assess whether the inhaler is effective and the patient's condition is improving. Observing changes in their respiratory status can provide valuable information regarding the severity of the attack and whether further assistance, such as calling emergency services, is necessary.

The other options do not appropriately address the urgency of a severe asthma attack. Encouraging deep breathing and giving water may not provide immediate relief and could exacerbate the situation. Laying flat can actually worsen breathing difficulties for someone in an asthma attack, as it may restrict lung expansion. Calling emergency medical services is important if the inhaler is not immediately effective, but initial assistance with the inhaler is a more direct course of action.