叭

ba̅ = b + a1

denote a sound or sharp noise (gunfire etc)

叭 = 八 + 口 : Beelzebub (b) is firing eight-balls (八) at mandarins (口) in front of the ashram (a1) just because he likes the sound (叭) of the gunfire and of the eight-balls crushing the mandarins.

叭 character breakdown

叭
- 八
  - 丿
  - ㇏
- 口

口

kǒu = k + ou3

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

Mnemonic symbol: 口 shall be represented by a mandarin. Karl Marx (k-) is enjoying a mandarin in the outhouse's living room (ou3).

八

ba̅ = b + a1

eight; 8

八 = 丿 + ㇏ : Mnemonic symbol: an eight-ball.

Beelzebub (b-) wants to find new ways to lure people into playing pool billiard. To this end he is meditating on top of an eight-ball (八) in front of the Ashram (a1). He uses a finger (㇏) and a banana (丿) as incense to create the right atmosphere.