I wanted to help Gerud in Riverwood who asked me to warn the Jarl of Whiterun about the dragon attack, so when I get there I warn him and he immediately sends me off to get the dragonstone.
So I go on kicking ass until I get to the last guy who is in a tomb in front of the first dragon word of power. Thing is that he also has dragon power and kills me in an instant. After I saw that the first dragon encounter is before that (so I can get a dragon soul and activate my first word of power having the chance of killing the bastard) I get back to Whiterun to see if I can still access the first dragon encounter but I'm failing miserably. Can someone help me with this?