How to exit insert mode while editing a command?

[danijar]

I'm aware of those two flags to start each prompt in normal mode:

let g:vimshell_enable_start_insert = 0
let g:vimshell_enable_stay_insert = 0

However, how can I switch back to normal mode while typing the current command? I would like to edit the typed command before executing it, using normal mode navigation. <esc> or <c-c> have no effect for me.

[Shougo]

What is your problem?
You can use <ESC> key to exit the insert mode.

Please create the minimal vimrc less than 20 lines and upload the reproduce ways from Vim starting.
I will test it.