The notion of a creature beeing “adjoining” to a different appears generally to contain beeing in an adjoining 5-ft sq.. The one point out I discovered about this within the guidelines pertains to melee assaults :

With a standard melee weapon, you possibly can strike any opponent inside 5 toes. (Opponents inside 5 toes are thought-about adjoining to you.)

I’m wondering nonetheless if this definition is an ordinary case for medium measurement character, comparable to their pure attain after which extends for bigger creatures, or if this measure of 5ft step is about in stone.

For example for my query, I’ve a Giant character prepared to make use of the feat Bodyguard to guard one ally who’s 10ft from her. 10ft means the opposite character is in her pure attain and it could appear logical to me to permit the motion of Bodyguard, however is basically the ally thought-about adjoining ?