Does anyone know what Toba might be saying at the end there? "suki ____" Anata?

Probably “suki dakara” which is “because I like you”

I might be off the mark but toba most likely said 好きだから (suki dakara) [because i like you] but sakurai probably misread it as 首だから (kubi dakara) [because ill fire you] lmao