Once the Dagger Mastery token was placed into the puppet's chest, it immediately started to take its stance, same as Eiro.
And then, during a seemingly random moment, the puppet started attacking first with a rapid forward movement in the form of a stab that Eiro managed to dodge with the help of Air Magic, and then continued back-stepping away from the Puppet as it continued its relentless attack to force Eiro into a situation where he couldn't dodge anymore.
But at some point when the Puppet stabbed the wooden dagger upward, Eiro took that chance and instead of stepping backward again, he jumped forward and tried to attack the puppet, hitting his wooden dagger onto its shoulder. This wasn't a win for him yet, however, since he, for now, gave the puppet a better chance to attack Eiro as well.