Verb conjugation of "abtöten" in German

My first stop was great. I went there by myself not knowing anyone. I hired a room for two nights and walked around the city. After I had moved to my second stop for another two days something strange happened.
Joanna started kindergarten 2 weeks ago. She got used to it very quickly and I must say that I am very pround of her. She is now 23 months old and we are going to celebrate her birthday in three weeks.
The young women rowed towards us and tried to sell food and souvenirs. We were not interested and she tried to block us and prevent us from swimming back to our vessel. So we dove beneath her.