We had an afternoon learning about polar bear behaviour and how to deter them. Subtle noises can work, and making yourself big can work too but if you need to scare a bear away, items such as bear bangers and flares are your friends. If a bear charges for you – there is really only one option and that is to shoot it. We went to a shooting range and shot a WW1 Mauser rifle. This bought many (many) tears to my eyes. I hate guns!