He joined Flacius in opposition to the adiaphorism of the Wittenberg circle and published a Disputation von Mitteldingen in 1550. In that same year he contributed to the Magdeburg Confession as its primary author. He remained in Magdeburg after its capitulation in 1551, and kept up the dispute against Osiander and Major.
He allied himself with Flacius in opposition to the neutralism of the Wittenberg circle and published a Disputation von Mitteldingen in 1550. He also contributed to the Magdeburg Confession as its primary author. After Magdeburg's surrender in 1551, he continued to dispute Osiander and Major.