Исподтишка is a dramatic adverb that translates to 'stealthily', 'slyly', or 'in an underhanded way'. It describes an action done secretly, often with malicious intent, like an attack from behind.
In the song, this word creates a dark, cinematic image: "Исподтишка летят ножи" (Knives fly stealthily). It perfectly captures the theme of betrayal and paranoia, suggesting a danger you can't see coming from someone you might otherwise trust.
BI-2 delivers a dramatic rock track about burning bridges and hitting complete emotional detachment. The song starts with an apocalyptic flare: "Агент зимы поджёг листву / Весь мир горит" ("An agent of winter set fire to the foliage / The whole world burns"). The singer claims he lives without backup plans, using the aviation idiom "без запасных аэродромов" ("without alternate airfields"). The city lights look foreign now, and knives fly from behind his back courtesy of someone close—"мой близкий враг родней чужих" ("my close enemy is dearer than strangers"). There is a sharp bit of wordplay here on betrayal: "пустоту нельзя предать / А вот любовь совсем не сложно" ("you can't betray emptiness, but love is not hard [to betray] at all").
Instead of wallowing, the chorus pivots to fierce defiance. He realizes that nothing holds him back: "Меня не держат корни / И при любой погоде / Я внутренне свободен" ("Roots do not hold me / And whatever the weather / I am internally free"). Then comes the ultimate exit. He leaves the past behind "наотмашь хлопнув дверью" ("slamming the door with a backhand swing"). The Russian word "наотмашь" describes a reckless, full-force blow, giving that door slam pure physical anger. He wraps up his manifesto with zero debts and zero trust: "Я никому не должен / И никому не верю" ("I owe no one / And I believe no one"). It is dramatic, blunt, and makes solitude sound like absolute power.