Pathfinder

It's because your health is critically low (really, with health that low you'll want to rest). If your current health is lower than your maximum endurance, that bar'll appear.

not really .. you cant use 80% of the enchantments ... just the basic ones .. not the good ones ... (draining, second chance, the phrone crits ... ) if you could enchant as you want you will be right , but thats not the case. That's the point, though. Some of the weapons you can pick up early on have strong/unique enchantments that make them worth keeping since you can upgrade or add standard enchantments to them later.