Dont you know you have to eat vegemite regularly so that your blood is laced with trace amounts of it? When the dropbears attack they will be poisoned from your blood and their teeth will rapidly decay from the corrosive substance you are now laced with. Once their teeth have rotted out this gives you two options: A) stand your ground and try to kill it- watch out for their claws though for some reason they dont decay and rot when the blood is on them. B) run for your life, you have maybe only three minutes until the dropbear will come out of its thrashing, enraged state, after which it will usually crawl away and try to find somewhere to die peacefully. (Note: this is three minutes of pure animal rage you will have to contend with if you try to fight it, if viable you should always run as now that the dropbear is poisoned your work is done here anyway) Either way you really need to get the vegemite into you and you should be alright, remember to cover your neck and eyes while out in their natural habitat.