Anger and fire being dreadful results though they are small. explain

Anger and fire are small because they start in a harmless and diminutive way. The fire starts with a spark, while the anger starts with a conflict, an unresolved situation. Both fire and anger can be eliminated in their initial and minute versions. However, if we let the fire and the anger grow, they will be immense, dangerous and destructive.

Fire and anger cause terrible situations, fire with its destructive power can cause great disasters and consume everything around you in a wave of destruction. Anger acts in a similar way and can destroy people's relationships, friendships and peace.

If you mean combined then it's stated out of anger people tend to not realize what is going on or what they are doing, someone could set a fire and burn down a whole place, or kill someone in the process, other than that anger can be bad because it leads to bad results like bullying and fire can painfully hurt somebody even if those two are small.