

Q1: I activated this card's On Play When Digivolving effect, and when my opponent's Digimon would leave the battle area for the 1st process, an immediate-type effect such as a "when ... would leave" effect caused this card to be removed from the battle area. Can I then process the part of the effect after "then" in this card's effect?
Yes, you can. If an effect activates, it is to be fully resolved even if the card that activated the effect is removed from that area during the processing.
Lv.5 Oboromon BT18-080 C Ultimate | Virus | Undead [On Play] [When Digivolving] Delete 1 level 4 or lower red, green, purple or white Digimon. Then, delete 1 blue, yellow, black or white Tamer with a play cost of 3 or less. --- <Retaliation> (When only this Digimon is deleted in battle, delete the Digimon it battled.)
Lv.5 Oboromon BT18-080 C Ultimate | Virus | Undead [On Play] [When Digivolving] Delete 1 level 4 or lower red, green, purple or white Digimon. Then, delete 1 blue, yellow, black or white Tamer with a play cost of 3 or less. --- <Retaliation> (When only this Digimon is deleted in battle, delete the Digimon it battled.)
Lv.5 Oboromon BT18-080 C ultimate | Virus | Undead [On Play] [When Digivolving] Delete 1 level 4 or lower red, green, purple or white Digimon. Then, delete 1 blue, yellow, black or white Tamer with a play cost of 3 or less. --- <Retaliation>
Lv.5 オボロモン BT18-080 C 完全体 | ウィルス種 | アンデッド型 【登場時】【進化時】赤/緑/紫/白のLv.4以下のデジモン1体を消滅させる。その後、青/黄/黒/白の登場コスト3以下のテイマー1体を消滅させる。 --- ≪道連れ≫(バトルでこのデジモンだけが消滅したとき、バトルした相手のデジモンを消滅させる)