YOU SAID:

They're about to start hitting in the back room

INTO JAPANESE

彼らは奥の部屋で当たり始めようとしています

BACK INTO ENGLISH

They are going to hit in the back room

INTO JAPANESE

彼らは奥の部屋にぶつかるだろう

BACK INTO ENGLISH

They will hit the back room

INTO JAPANESE

彼らは奥の部屋にぶつかるでしょう

BACK INTO ENGLISH

They will hit the back room