You get the following error when connecting an air grab with the "Feral" weapon type:
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ERROR in
action number 1
of Step Event1
for object obj_character:
Variable <unknown_object>.attack_is_grab_air(102184, -2147483648) not set before reading it.
at gml_Object_obj_character_Step_1
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gml_Object_obj_character_Step_1 (line -1)
gml_Object_obj_player_feral_Step_1 (line -1)