Mortality clarified in a single strike!

You have learned to master the intricacies of your weapon and are able to maximize your utility with it. When using a weapon you are proficient in, you gain the following benefits:

• Critical range is treated as 1 larger for your attacks. If a weapon has a critical range of 20, this increases it to 19-20.
• After landing a critical strike, you may choose to forego the extra damage in order to make an attack against another enemy within your reach as a reaction.