Ashe brought over the string to Siderius.
The string was made with care and it wasn't just any thread you could find out in the market. It was made with a resistance fiber, harvested from the tree. Then, each fiber was weaved and twisted together to form a unified resilience piece of string.
The string was not elastic. It had strength and durability. In contrast to common misconception, a string of the bow could not be flexible, that would ruin the bow.
A bowstring must be tough and durable. Only a slingshot or a modified sling needed a stretchable string.
Then it was time to put the string onto the bow. This task was much more difficult than Ashe's expectation.
Siderius tied the bowstring on one nock of the bow. Then he placed that nock on the ground, over to his far foot to secure it.
Siderius used his knee to apply pressure on the middle of the bow, bending it down and putting tension onto the bow, making it curved inward.