Can someone please explain 3 things...
1-I just activated windstorm to stop relinquish from attacking and it didn't turn him to defense
2: they no longer let you use enemy controllers 2nd effect to take embodiment to your side of the field
3: I thought if you attacked, and opponent activated mirror wall, after one of your monsters died, you can twister it from your hand and destroy it before attacking again?
I dont know about the first and third complaint, but you were never able to take over the embodiment with enemy controller. Since it is still technically a trap card (as stated in its description) enemy controller doesnt recognize it is a monster
3- Yes you can do it after your monster died. You can do it before your monster is destroyed if your opponent is stupid enough to activate Mirror Wall during Battle Step.
Djinn makes an ritual monsters IMMUNE to traps(all traps)
Apophis is a TRAP even in "monster form", but when relinquished absorb it, he will have his atk/def
Twister is a quickplay, yes, you could use it in Battle phase after the 1st atk from your hand, or from the field if you set it 1 turn before(like a trap).
In order to take control of a Trap Monster such as Apophis, you need an empty S/T zone. In other words: you need 2 S/T zones total in order to take control of Apophis (1 to activate Enemy Controller, and another to place Apophis in: Enemy Controller does not remove itself until AFTER it has taken control of a monster, after all).