Rakuten Software Engineer interview questions

Get reached out by headhunter, 5 rounds of interview in total, 3 technical rounds and 2 bq rounds with cross-sites interviewers and CTO. The whole interviewing process is okay-ish, but somehow I get threatened by the headhunter in the final step. Headhunter said something like the offer is in progrss already, but if u can't promise to take the offer and onboard to rakuten, I will decline the offer instead of u directly, even though at this stage both the salary and job rank are not disclosed - at all. That's very shocking : )