Talent v. Spell: Acrobatics/Stalwart

[hcobb]

Whether 'tis easier on the memory points to charge
Through slings and arrows with mere talents,
Or to take up the practice of witchcraft,
And by casting reverse these missiles?

Both Acrobatics and Stalwart apply bonuses to DX rolls under some circumstances, but where do these overlap (for a two die bonus, woot!), and what does each not cover?

Does Acrobatics reduce the risk of being knocked over by a trample from a multi-hex figure, shield rush or falling into pits when knocked over by a Trip spell? Stalwart clearly doesn't because this is an attack.

Acrobatics helps "avoid some large falling object" (ITL 38), but how about smaller objects like darts fired from a trap? Again this is an attack so Stalwart doesn't apply.

Both Acrobatics and Stalwart help retain footing in naturally slippery terrain, but do they help against the spell Slippery Floor?

Acrobatics ought to help jump over a known pit, but does either talent or spell help on a save against an unseen trap door?

Does either Acrobatics or Stalwart help against walking through a magical gate? (ITL 56)

Acrobatics doesn't negate the DX penalty of broken ground, but Stalwart does (up to three points).

Climbing a cliff is best done with the Climbing talent, but does either Acrobatics or Stalwart help on saves vs losing your grip? Or recovering your balance while rolling down a steep slope?

Does either Acrobatics or Stalwart help when running in total darkness? (ITL 119)

What bonuses does either Acrobatics or Stalwart apply against water? (ITL 120)

And finally does Stalwart negate the DX penalty from standing in mundane or magical fire? (Or on top of a fallen body, alive or dead?)