So. I create a (sort of) Ward with Biting Steel. It is designed to active when the paper it is written on, is torn.
1) Since I roll for the Invocation when preparing the ward, presumably I also spend Opportunities when preparing the said ward?
2) The ward is wrapped around the saya and tsuba of an ally's katana, is such a way that if/when the sword is drawn, the paper will be torn leading to the Invocation being activated. I've spend an Opportunity to: "After performing this action, if you have the weapon you enhanced readied, you may immediately perform a Strike action with it." (L5R5th core, p. 202). Can this be used to grant the wielder of the sword (not me) an immediate attack?
PS: I've seen people put the symbols for successes, opportunities etc in their post. How was this done?