THUMP THUMP THUMP.

The sound of my heart beating as panic starts to build up.

POUND POUND POUND.

The sound of the 'thing' pounding on the door.

BANG BANG SMASH.

The sound of the door breaking down.

GO GO GO

The sound of another's panicked voice.

HUFF HUFF HUFF

The sound of my lungs as I run away.

CLACK CLACK CLANG

The sound of the 'thing' trailing close behind.

SNAP CLICK THUMP

The sound of the 'thing' colliding into the locked door.

HEH HEH HEH

The sound of my lungs as my blood rushes back to my head.