Unlike Trump, Khamenei is prudent and has survived decades at the helm. +
There are, ofc, dangers and things might spiral EVEN out of his hand but I'd say that's unlikely.
Some of the past US actions that didn't lead to US-Iran war include shooting down an Iranian airliner which killed hundreds of innocent Iranians.
1) He knows a direct confrontation with the US will mean the destruction for his country and his regime.
2) He knows inaction will have severe consequences for his revolutionary prestige inside and outside Iran. Not to mention an actual loss of base.
My guess is he will try to find a middle ground and do anything he can to avoid war.
He might also authorize immediate secret negotiations with Trump.
Fight with all of our might to prevent war. #NoWarOnIran!
We must struggle for de-escalation. Escalation will have ZERO progressive content for either of the countries.