Even if the thrower still has to stop, get up after a dive, or even come back into the field because they ran out of the field, the marker may start the count.
If the offensive player needs some time to recover because they had to avoid an object outside the field (for safety, there shouldn't be any, but in practice this may be the case) the marker should not count until the player has had that time.
If the thrower regains possession of an accidentally dropped disc before it contacts the ground without another player touching the disc, that possession is considered continuous. If the thrower regains possession of an accidentally dropped disc before it contacts the ground and after another player touches it, it is considered a new possession.
If the thrower catches a pass in the central zone, but momentum takes them out-of-bounds, the marker can start/continue the stall count if they are within 3 metres of the pivot spot, even if they are not within 3 metres of the thrower.