You can post more than drawing your weapon and going to help Siliwen.. you have two attackers close to you and while you wer surprised by the sudden attack it only caused you to lose the initiative.. you can still draw your weapon and attack one or more riders who are already within range.
If you turn to ride over to Siliwen, who is apparantly guarded by your strange new companion, then the two attackers after you might get a nice attack against your back.
Of course the choice is yours.. just trying to clear things up for you.
