Assassin starts to look for the easiest way up to the first floor. He uses his superior intelligence to think of a plan with what little there is around.
The shifter will try to dodge out the way of the crossbows as he heads for the door. Hoping that the others outside are seeing him headed for the door. The shifter is using speed and arm stretching to knock crossbows off target.
Krusten's last action remains the same for now and I've included the d100 roll you requested.
Assassin continues looking for a way in to help Shifter. (Basically doing my same action from last post).
Assassin, tells Krusten his plan - he will hunch over and she can run up fast and use his back to propel herself to the 1st floor to assist Shifter.
Krusten takes up Assassin's plan, but first runs around looking for a stick and then jumps up to the first floor to use the stick in the same way she would use a spear. Then look for Shifter.