What exactly was the plan here, allowing Gon and Killua to face Neferpitou?

Bear in mind at this point Netero had already faced her (with Terpischora) and this is him walking out after he met Meruem so he knew first hand the top ants were in a different league. Yeah OK Gon and Killua are the 2 most competent children on earth at this point, Ging's son and a Zoldyk, but she would killed both of them instantly.