Not a waza in and of itself, but a good start to many techniques. On the tsuki, use the irimi parry and enter very deep. When practicing with a partner, ask your partner to jab or punch and pull it back as quickly as he can. If Tori does not enter deep enough, Uke can fire off a second punch to Tori‘s ribs, for example. But, if Tori goes deep and uses the front tegatana to parry, then even if Uke pulls his arm back, Tori should still be ‘attached’ to him and safe.