The quoted stage directions here demonstrate the idea that Parris is an extreme character. He is not ration but is emotional and often desperate.
At the opening of the play, Parris is worried that his reputation will suffer and he may lose his position if the town discovers that his daughter Betty and niece Abigail were practicing witchcraft in the woods.
Parris, Salem's minister, and Abigail's uncle, is a weak character who appears to enjoy and to be protective of the status which his position brings.
His emotional state in the opening seen is one of quiet seething - quiet because he wants to keep the situation between himself and Abigail.
Fear and anger are the qualities most prevalent in his character as Parris worries about losing his position and authority in the town and eventually worries about losing his life if the town should turn against the hangings and the court. At no point is Parris calm or fully in control of himself. Fear, rage and outrage all play through him as he strives to defend his position and direct the towns attentions.