In duo, one person starts in a neutral 'floating' position, waiting for a touch on the body by the other. When feeling the touch of the other, it can be thought of as a drop of ink, spreading in a body of water, acting as an impuls to engage in an improvisation. Just like the ink would spread, the movement can develop and resonate throughout the body. Does it spread slow but equal? The other one observes and gives new touchpoints, new impulses, when they feel like it. Then switch roles.
In the second round, instead of a drop of ink, imagine a small stone that's being dropped in (your) body of water.