You’ve got the answer, you can’t.
To do this you really need to forget about using the ACF have_rows() loops and instead get the contents of the repeater and use the array it returns
// return all the contents of the repeater in a nested array
$slides = get_field('slide');
// loop over array
if ($slides) {
foreach ($slides as $slide) {
// output information from this slide
foreach ($slides as $inner) {
// output nested slide information
} // end nested foreach
} // end outer foreach
}
