to choke / to stifle / to restrain / to hold back / to hold in (urine) / to hold (one's breath)
憋
=
心
+
敝
:
To prepare for battle Brunhilde (bi) wants to stifle (憋) her emotions, so she chokes (憋) her heart (心) with a pair of old worn-out shoes (敝) in front of the elevator (e1).