Faced with an overwhelming sequence of tragic news, Job responds immediately with a mix of deep mourning and absolute acceptance of divine judgment. He first stands up, rising specifically so that he can bless God from a standing position [מלבי״ם]. Overcome with sorrow, he then tears the garment he is wearing [מצודת ציון, מצודת דוד, ביאור שטיינזלץ]. This act of tearing his clothes is directed specifically at the loss of his sons and daughters, following the traditional practices of mourners [מלבי״ם, אלשיך].
Next, he removes the hair from his head. The primary approach among commentators is that tearing or shaving the hair serves as a further sign of mourning [רמב״ן, אבן עזרא, מצודת דוד, ביאור שטיינזלץ, רש״י, מצודת ציון]. While tearing his garment is an expression of grief for his children, the removal of his hair is a reaction to the loss of his property. This distinction is made because the Torah prohibits creating a bald spot in mourning for the dead, but permits it when grieving the loss of wealth [מלבי״ם]. Alternatively, this act represents the humbling of his pride, as his wealth was plundered by the Chaldeans, a group he had previously looked down upon [אלשיך].
Finally, Job drops to the ground. This downward motion mirrors the very fire that had just fallen from the sky to strike his estate [אלשיך]. Once on the ground, he bows before God [ביאור שטיינזלץ]. This final act of submission highlights his extraordinary righteousness, integrity, and fear of God. Even after his entire world is destroyed, he does not stop thanking the Creator. He blesses God for the bad just as he would for the good, fully recognizing that every tragedy came directly from Him, rather than from the physical messengers who carried out the destruction [מצודת דוד, תקות אנוש, אלשיך].