Deafblind people communicate in many different ways determined by the nature of their condition, the age of onset, and what resources are available to them. For example, someone who grew up deaf and experienced vision loss later in life is likely to use a sign language (in a visually modified or tactile form).
To burn someone's bridges is too forget about them. Ryan built bridges, meaning he still might want to come back to her. He is telling her to burn them, because he can't seem to do it himself. It isn't easy for him to forget her, and hes asking for her help.
In general combustion or burning is a chemical reaction in which a fuel combines with oxygen. When there is insufficient oxygen, burns incompletely and produces by-products of combustion. Incomplete combustion by-products of carbon-based material often have a color (red nitrogen dioxide) or an odor (aldehydes). Toxic and other harmful products; There are a lot of combustion appliances including space heaters, gas ranges and ovens, furnaces, gas water heaters, gas clothes dryers, wood or coal-burning stoves, and fireplaces. The common fuels burned in these appliances are natural or LP gas, fuel oil, kerosene, wood, or coal.