Hijacked jets destroy Twin Towers: a creeping horror

The horror arrived in epsodic bursts of chilling disbelief, signified first by trembling floors, sharp eruptions, cracked windows. There was the cruel sight of bodies helplessly tumbling out, some of _____ in flames.

Finally, the high and impressive towers themselves were reduced to nothing. Dense plumes of smoke raced through the downtown avenues, coursing between the buildings, shaped like tornadoes on their sides.

Every sound was cause for alarm. A plane appeared overhead. Was another one coming? No, it was a fighter jet. But was it friend or enemy? People scrambled for _____ lives, but _____ didn’t know where to go. Should people go north, south, east, west? Stay outside, go indoors? People hid beneath cars and each other. Some contemplated jumping into the river (…).

Fonte:The New York Times, Sep. 12, 2001.

GLOSSARY
chilling disbelief – incredulidade assustadora
trembling floors – o tremor dos andares
to scramble – lutar

Which word, from the text, is being used as an adjective?