Sometime this skill will summon a unlimited time dragon until pass a map. And in this time, can summon the second dragon. Don't know why happen.
This bug occures when you switch maps with your summon still active, however it's just a visual bug. You can click the buff away and you will still see the summon, however it will deal 0 dmg. This is why you can have 2 summons active on your screen.
