A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 1 December 2008
how will having Yakamo's End in play interact with the playing of The Lion's Strength? That is to say, would I be able to bring one of my opponent's Units into the battle without straightening it?
Similarly, Would the dark virtue Control keep a "harpooned" unit from being straightened?
Yakamo's End: Terrain Battle: While this card is in play, negate the straightening of any cards at its battlefield.
The Lion's Strength: Battle: Target one of your opposed Lion Clan Personalities: Target a Personality not at the current battlefield. Move him to the current battlefield. Straighten him if you do not control him.
Control: Dark Virtue Open: Target one of your unbowed Samurai: Target a Personality. He can not straighten while your Samurai remains unbowed and in play.
Zen Faulkes (rules official), 1 December 2008
how will having Yakamo's End in play interact with the playing of The Lion's Strength? That is to say, would I be able to bring one of my opponent's Units into the battle without straightening it?
Similarly, Would the dark virtue Control keep a "harpooned" unit from being straightened?
Yakamo's End: Terrain Battle: While this card is in play, negate the straightening of any cards at its battlefield.
The Lion's Strength: Battle: Target one of your opposed Lion Clan Personalities: Target a Personality not at the current battlefield. Move him to the current battlefield. Straighten him if you do not control him.
Control: Dark Virtue Open: Target one of your unbowed Samurai: Target a Personality. He can not straighten while your Samurai remains unbowed and in play.
This is a variation on a frequently asked question, namely, if one effect is negated, will the others still happen?
Which is covered in the Rules FAQ: http://rules.l5r.com/FAQ#If_one_effect_ ... _happen.3F
To quote from it, "All effects are independent. Negating one does nothing to the resolution of all the others."