Final answer:
The phrase directed at Mark is an example of negative skill feedback, indicating what he should not do. To be more effective, it should be paired with suggestions for acceptable conduct.
Step-by-step explanation:
The statement "Mark, don't push Steve again" is indeed an example of negative skill feedback. This type of feedback focuses on what not to do, rather than providing guidance on how to improve a behavior or perform an action correctly. Negative skill feedback can discourage the behavior being corrected, but it is often more effective to follow up with positive feedback that suggests alternative, appropriate behaviors.