When I take the Runestone node in the Runebolt skill tree, bolts cast directly or via channeling with the Awakened Runestone node taken do not give the Haste buff from the Arcanist node, the buff icon appears and immediately disappears, regardless of how many points are thrown into the node. In this case, the buff is given as usual if the bolts are cast by the Antipode of Rune Slinger invocation. Also, with the Runestone, Awekened Runestone and Arcane Restoration nodes taken, bolts give mana when hitting enemies during skill channeling, but the Arcane Restoration description indicates direct casting of bolts, while they give stacks of the Runeweaver node buff only from one bolt fired during channeling.