Men wearing life vests speed across a body of water in an orange boat.
The men are on their way to a rescue.
The men are simply boating, they aren't trying to rescue anyone.
Speeding in boat does not mean that they are on rescue.
Men can be on way to rescue or not on way to rescue and wearing a life vest and speeding across water in a boat does not give one the certainty that a rescue operation is taking place.