There is a little issue with the Ready Action trigger you have chosen [@Ryonara]

[quote=PHB p.193]When the trigger occurs, you can either take your reaction [u]right after the trigger finishes[/u] or ignore the trigger.[/quote]
Emphasis mine. To finish starting an attack is a very strange limbo of hacking apart an action, and that cannot happen for clarity's sake. Would you like to make scarce with the Readying to save your reaction or shift the trigger to after attack?