Magic might be involved here

Dankie, I can finally breathe properly again

It's a random title generated by a bot, but it fits, coincidentally

Jacob Grimm cites a variant in 18th-century Chorographia Bahusiensis by Johan Ödman (1682-1749) according to which the Strömkarlen must be offered redemption or he will merely break his instrument and weep bitterly. Famous fiddlers who were rumored to have learnt from the Fossegrim include Torgeir Augundsson (1801–1872) known as Myllarguten and Ole Bull (1810–1880) whose statue in the centre of Bergen depicts a fossegrim playing his harp under the falling water.

Fossegrim is said to be willing to teach away his skills in exchange for a food offering made on a Thursday evening and in secrecy: a white he-goat thrown with head turned away into a waterfall that flows northwards, or smoked mutton (fenalår) stolen from the neighbour's storage four Thursdays in a row. If there is not enough meat on the bone, he will only teach the supplicant how to tune the fiddle. If the offering is satisfactory, he will take the pupil's right hand and draw the fingers along the strings until they all bleed, after which he will be able to play so well that "the trees shall dance and torrents in their fall stand still".

Fossegrim is described as an exceptionally talented fiddler: the sounds of forest, wind and water play over his fiddle strings. Fossegrims can be induced to teach the skill. The Swedish strömkarl's lay is said to have eleven variations, the final one being reserved for the night spirits because when it is played, "tables and benches, cup and can, gray-beards and grandmothers, blind and lame, even babes in the cradle" will begin to dance.

I wish I could, but am currently stuck in a tube face down.
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But yes, this is how you weigh small birds apparently, this pic was posted to twitter by Kyle Hill(Sci_Phile) and he does various experiments, even scienceing video games

Shots fired scares the birds away

Yes, he landed a little bit earlier this evening

There's tons more to read, including verses from The Poetic Edda
https://en.wikipedia.org/wiki/Norns

There is no clear distinction between norns, fylgjas, hamingjas and valkyries, nor with the generic term dísir. Moreover, artistic license permitted such terms to be used for mortal women in Old Norse poetry. To quote Snorri Sturluson's Skáldskaparmál on the various names used for women:
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Woman is also metaphorically called by the names of the Asynjur or the Valkyrs or Norns or women of supernatural kind.
These unclear distinctions among norns and other Germanic female deities are discussed in Bek-Pedersen's book Norns in Old Norse Mythology.

Skuld is derived from the Old Norse verb skulu, "need/ought to be/shall be"; its meaning is "that which should become, or that needs to occur". Due to this, it has often been inferred that the three norns are in some way connected with the past, present and future respectively, but it has been disputed that their names really imply a temporal distinction and it has been emphasised that the words do not in themselves denote chronological periods in Old Norse.

The origin of the name norn is uncertain, it may derive from a word meaning "to twine" and which would refer to their twining the thread of fate.[2] Bek-Pedersen suggests that the word norn has relation to the Swedish dialect word norna (nyrna), a verb that means "secretly communicate". This relates to the perception of norns as shadowy, background figures who only really ever reveal their fateful secrets to men as their fates come to pass.
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The name Urðr (Old English Wyrd, Weird) means "fate". Wyrd and urðr are etymological cognates, which does not guarantee that wyrd and urðr share the same semantic quality of "fate" over time. Both Urðr and Verðandi are derived from the Old Norse verb verða, "to become". It is commonly asserted that while Urðr derives from the past tense ("that which became or happened"), Verðandi derives from the present tense of verða ("that which is happening").

Beside these three famous Norns, there are many others who appear at a person's birth in order to determine his or her future. In the pre-Christian Norse societies, Norns were thought to have visited newborn children. There were both malevolent and benevolent Norns: the former caused all the malevolent and tragic events in the world while the latter were kind and protective goddesses.

Apparently