An aura is a condition on the target
An aura is an Element that remains on a target. It can decay over time or be consumed by reactions. Reapplying an Element and triggering a reaction are different operations; a reaction does not necessarily remove every remaining Element.
Anemo and Geo ordinarily trigger reactions with existing auras rather than leaving their own persistent aura. Some states allow multiple Elements to coexist. An Element icon is a useful cue, not a complete measurement of the remaining aura.
A damage hit is not always an application
An attack can deal Elemental damage without applying that Element on every hit. Internal cooldown, usually shortened to ICD, controls application for many abilities. It is separate from the visible cooldown that prevents you from casting a Skill again.
Application rules may use a timer, a hit count, both, or an ability-specific exception. There is no single rule that describes every Skill and Burst. A multi-hit attack should not be counted as the same number of reactions without checking its application behavior.
Compare aura supply with consumption
Application strength and timing affect how long an aura can support reactions. More damage does not imply stronger application. Adding another off-field attacker can alter which Character triggers reactions rather than simply adding another independent damage source.
Inspect the sequence on the same target. Does the intended aura exist before the damage window? Does another ability consume it first? Does the next application arrive in time? Those questions explain more than counting how many party members share an Element.
Related reading: Understanding Elemental Reactions
Read a team as a sequence
Kaeya’s Frostgnaw provides a short Cryo application, while Glacial Waltz follows the active Character and hits over its duration. Their talent damage tables describe damage; they do not by themselves establish the exact reaction frequency of a complete team.
Use the Character’s Kit for ability wording and the team’s actual order for context. Check a technical ability reference before making claims about exact gauge strength or application intervals. This introduction intentionally does not prescribe either.
Related reading: Kaeya’s Guide & Kit · Team Roles & Rotations