帛
=
巾
+
白
:
Somebody stole Beelzebub's (b) silken panties (帛) and now he won't get them back until he declares defeat! He chased the thief with a towel (巾) wrapped around his waist, but now, in the observatory's kitchen (o2), he finally declares defeat by waving a white flag (白).
lit. a needle concealed in silk floss (idiom) / fig. ruthless character behind a gentle appearance / a wolf in sheep's clothing / an iron fist in a velvet glove