When you try to take the leg back immediately, the horse becomes more stiff and tense. In this kind of situation, try using the TTouch on the hindquarters before picking up the foot. Since most horses are expecting their leg to be held up after being picked up, resting the toe is very non-habitual and helps the horse stay focused and comfortable. With this horse, I am holding the hock lightly to encourage him to stay in this position. In this case, I would stroke the tendon with my other hand.
Some people teach their horses to rest a toe as they clean the hoof.
Pick the leg up as shown, and make horizontal circles with the foot at whatever height is easy for the horse. The circle, as with the front leg, is in relationship to the other hind leg. Take the hoof forward, to the outside, back and then to the inside. Circle the leg 3 or 4 times in each direction and then rest the toe. Rest your outside elbow on your outside leg and use your body rather than just your arms.