At first, everything was perfectly fine. Amar managed to cover the area around the Fire Bomb Lord with his flowers
He also sealed that area so that even the shockwaves would not be able to damage the realm
A Lord without a Supreme Domain might be able to kill a person that has one if they decided to self destruct but they need to catch their enemies off guard
Since the Fire Bomb Lord was completely bound by the flowers earlier, he can't even catch Amar off guard with his self-destruction decision
Thus, he certainly wouldn't be able to kill Amar even if he were to sacrifice his life
A prepared Lord with a Supreme Domain wouldn't be killed by this kind of self-destruction but that is only at normal times
Without any warning, an invisible power spreads. This power causes Amar's body to stiffen and he can feel himself being terribly suppressed