Which act would lead to a 10-match punishment?

A 10-match punishment is typically reserved for serious violations that compromise the integrity of the game or the safety of participants. Threatening an official falls into this category as it directly undermines the authority of match officials, which is crucial for maintaining order and fairness in sports. Such conduct is considered particularly egregious because it not only affects the game at hand but also sets a dangerous precedent for player behavior towards officials, potentially leading to a more widespread issue of disrespect and intimidation in the sport.

In contrast, while assaulting a player is also a serious violation, it may be adjudicated differently depending on the circumstances. Foul play encompasses a range of infractions, but it may not always lead to such a severe punishment unless it is extremely violent or reckless. Unsporting behavior toward a player, while inappropriate, is generally viewed as less severe compared to threatening an official, hence resulting in lesser disciplinary actions. Thus, the act of threatening an official stands out for its potential impact on the game's governance and the safety of those involved.