What is the ruling on invoking jinn when angry with someone, whether by directly appealing to them or by saying "may jinn take you"? Is this considered major shirk? Are both cases the same in ruling? And does "invoking those who are absent" refer to those who are unseen or those who are not physically present in the place?

The first phrasing: "Take him, O Jinn" or "Mobilize with him," is a supplication to the Jinn and is considered major Shirk (polytheism), because it is seeking help from other than Allah. This was affirmed by Ibn Baz - may Allah have mercy on him.

The second phrasing: Addressing someone by supplicating against them for the Jinn to take them, is not permissible. This is because it is a supplication against another without right, and Allah does not answer supplications that involve sin or severing ties of kinship.

As for supplicating to an absent person who cannot hear you, this is also Shirk, because it entails a false belief that the absent person has control over the universe or knows the unseen. This was clarified by Ibn Baz - may Allah have mercy on him.

The questioner is advised to desist from excessive and blameworthy delving into matters, as it leads to obsessive whispers (Waswas).