Uki holds knife in trailing grip, edge outward. Uki cuts at ribs, Tori jumps back just enough to avoid cut. Uki immediately stabs with point at base of Tori's neck. Tori comes in with kiai, blocking at the upper arm and performing Ude Tori Ni. Pin arm with knee, take knife.
Uke holds knife in stabbing grip, edge in. Uke stabs with overhead strike, at top of Tori's head. Tori parries with Nagashi, above elbow, and spirals hand in toward Uki's shoulder, much like in Ude Gyaku Ni. Once established, Tori takes Uke down by putting his weight onto Uke's (trapped) elbow, sinking and turning to the right. Take knife away while maintaining hammerlock.
Variation: Matt Bigham
Uki thrusts to abdomen of Tori. Tori pivots on left leg, rotating left arm clockwise to block. Keep right arm clear of blade. While sticking, grasp Uki's hand, and perform Katate Tori.
Log: Matt Bigham
Uki holds knife in thrust grip, but stabs underhand and upward. Tori block with Gedan Uke, and then obtains Ude Gyaku Ni.