Arkadij Sergeevič kak raz zakurival , poètomu ne zametil , kak na poslednej fraze Olafson počemu-to vorovato strel'nul glazami .
Arkadij Sergeevich as time za.smoke.imp.pst.sg.m, that_is_why not notice.pst.sg.m, as on last phrase Olafson because_of_something thievishly shoot.sem.pst.sg.m eye.pl.inst
Arkadij Sergeevich was just lighting the cigarette, so he didn't notice Olafson's thievish glance during the last phrase.