Stoping a Phase From Reacuring

[Deathbringer123]

Hey

Im Making a Script For a Boss and at 10% i want him to heal himself back to 30% i know how to do this but once players get him back to 10% he is just going to repeat this is there a way to make a phase so that it can only say be activated once if Poss Please post how

Thank You For Reading
Death

P.S If You Want The Phase Script Just Ask

[Deathbringer123]

Hmm I Got An Idea If I Have Only Register it Once it Wont Re-Register
Heres The Last two Phases

function Mokrash_Phase2(pUnit, event)
if mk:GetHealthPct() <= 50 then 
pUnit:RemoveEvents()
mk:SendChatMessage(12, 0, "No No My Little Adventurers Your Time Shall Come")
mk:FullCastSpellOnTarget(5, mk:GetRandomPlayer(1))
mk:RegisterEvent("Mokrash_FinalPhase", 10000, 1)
end
end

function Mokrash_FinalPhase(pUnit, event)
if mk:GetHealthPct() <= 10 then 
pUnit:RemoveEvents()
mk:SendChatMessage(14, 0, "SARGERAS I Call Upon you to Heal me in my Time of Need")
sar:SendChatMessage(12 , 0 , "Mok'Rash I Will Help You As You Have Statyed Loyal To Me And I Shall Empower You")
sar:SendChatMessage(12, 9, "By The Power of The Old Gods Heal My Kin")
mk:SetHealthPct(15)
 end
 end