Heimdall: You would defy the  commands of Loki, our king, break every oath you have taken as warriors, and commit treason to bring Thor back?

Sif: Yes.

Heimdall: Good.

Sif: So you'll help us?

Heimdall: I am bound by honour to our king. I cannot open the bridge to you.

Fandral: Complicated fellow, isn't he?

Volstagg: Now what do we do?

(Heimdall left the sword for them to open the bridge...)