All true, but the injection is nearly as unrealistic. There's a reason that anesthesiologists spend years learning how to drug people into unconsciousness safely. Too weak a dose, and the subject doesn't go under or doesn't stay under long enough; too strong a dose, and the subject dies. Also, if she were going to tranq him, why not just shoot a tranq bolt from the crossbow? It's a minor complaint, but this seems unnecessarily complicated.