The orc has recovered and is plunging toward you with his sword raised. You won't have time for a full spell so you try the fastest one you know. You yell, "Looky" and point at his shoe. When he looks down you kick up as hard as you can and run like hell.
You glance back and see him rolling over into a tree and sprawled on the ground.
stop and try a sleep spell (five seconds)
hit him with one of your really bad spells and turn him into a biscuit (two minutes).