For someone (agent maN- & theme i-) to go ahead before others in doing something.
Mangun'unnah Bāyaw ad Dāli' ta un ditu'u hodon.
Bāyaw will go ahead to Dalican and will wait for us (there).
Theme, a reflexive `oneself,' is not expressed.
Iyun'unnāyun umuy ad Dāli'.
You go ahead to Dalican.
For someone (agent & inst) to take someone or something (theme i-) ahead before others.
Iyun'unnam han batāwel'u ta unna' mangunud.
Take my carrying pole ahead and I will follow in a little while.