A Percussionist's Tour with Matthew Strauss, associate principal timpani and percussion

[@Richard-b5r9v]

At 1:14 Mahler indicated on the Percussionists part a tree twig on the shell of a bass drum and not a slap stick as is shown

[@matthewzadell]

Those are separate pieces/parts. The part you’re referring to is played with Rute, but his reference to use of a whip is correct.