Drying during asher yatzar

Hi,

Normally, one is not permitted to engage in a task while reciting a berachah (blessing), because this would be distracting and because this would reflect a lack of respect for the berachah. However, one may dry his hands while reciting the "Asher yatzar" berachah that follows use of the washroom, since drying is part of the mitzvah that one is performing, and not a separate, potentially disrespectful task.

[I must admit that I am confused as to what 'mitzvah' is involved here. - MT]

(Rivivot Ephraim 1:17)

Have a great day,
Mordechai