Some attacks are slow or require the user to “telegraph” their delivery, like flamethrowers or dragon’s breath. Such attacks state they may be “evaded.” If an attack doesn’t say it can be evaded, it can’t—victims are simply hit if the attack is successful and take damage.
If an attack can be evaded and the character is aware of it, he makes an Agility roll at −2. Those who are successful manage to avoid the attack and take no damage. If this was an area effect attack, the GM should place the figure to the side or rear of the template as makes sense in the situation.