Benefit of a Committed Action

When an opponent is engaging you, a safe
option is to Wait, once your opponent has
shown their move, you can React with any
Action while adding a Stat Mod to the roll.
However, if you declare an Action first, you
may Commit a followup Reaction, allowing
you to add a Stat Mod to a second roll in the
same turn. If you chose a bad Reaction,
you can Bail into a different Action, but you
must use a natural dice roll with no Mod.