Expression: أَخُوكَ كَالْأَسَدِ فِي الشَّجَاعَةِ
Your brother is like a lion in courage.
Maʿānī: it is an assertion, which can be emphasized if the listener's condition requires it.
Bayān: it is a mursal, mufaṣṣal simile, since both the particle and the shared quality appear.
Badīʿ: no particular embellishment has to be claimed merely because the sentence is effective.
A sound reading avoids forcing a category onto an expression without evidence for that category.