LH seat "idiots"
The LH seat "idiot" who advised you to keep your hand on the S/B lever in this very moment is may be correct
You have been operating flight controls and during this time the other pilot shoul operate MCP, FMC etc.
Further this is the core meaning of this rhitual- to prvent high roll rates during turn by quicly stowing interceptors should they fail in their diferential movement in initiation of the turn