Lord Command Mormont pulls a sword on a member of the Watch, played by new cast member Burn Gorman. You can see Rast behind Mormont. As to who Gorman’s character is holding? Looks like one of Craster’s wives.
Westeros.org is the premiere fansite for George R.R. Martin's A Song of Ice and Fire and related works, providing all the latest News as well as an extensive lore archive. You can also discuss the series on the forums, browse the fan-edited wiki and play the MUSH.