They could see someone trying to flirt with you and they didn't like that very much.

Rengoku: hmm..

Sanemi: who the hell is that.

Mitsuri: who do they think they are..

Shinobu: I don't like this.

Uzui: that's not very flashy.

Gyomi: should we stop them..?

Obanai: yeah we should..

Muichiro:..