SRD 5.2.1 · Conditions
A caster becomes Incapacitated while concentrating on a spell. Can they retain Concentration and spend a Reaction later in the round?
No; Concentration breaks and Reactions are unavailable.
Both restrictions are explicit. Becoming Incapacitated breaks Concentration and prevents any action, Bonus Action or Reaction. Do not wait for a separate damage-triggered Concentration save to apply the condition’s direct effect. If the condition later ends, the old concentration spell does not automatically resume.
Incapacitated alone does not list Speed zero, automatic failed saves or automatic critical hits. Those may come from another condition. Keeping the lists distinct prevents extra penalties from being added accidentally.
Which ongoing concentration effect ends now, and does another condition add movement or save restrictions?
While you have the Incapacitated condition, you experience the following effects. Inactive. You can’t take any action, Bonus Action, or Reaction. No Concentration. Your Concentration is broken. Speechless. You can’t speak. Surprised. If you’re Incapacitated when you roll Initiative, you have Disadvantage on the roll.
Source: SRD 5.2.1, 184. Online guide.
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