Which of the following is NOT considered a send-off offense?

Falling down on the field is not considered a send-off offense because it typically either results from a player losing their balance or being challenged by another player without malice. Send-off offenses usually involve more serious infractions that threaten the safety of players or violate the spirit of the game, such as violent conduct or spitting, which are clear breaches of the rules warranting immediate expulsion. Two yellow cards, while not a direct send-off offense in themselves, result in a send-off because they accumulate to equate to a red card. In contrast, simply falling down, unless malicious or intentional in context, does not carry the same level of severity and does not warrant a send-off.