3:34 AM, Saturday January 15th 2022
No problem.
There isn't much bulging occurring but I'll try to describe it differently.
Imagine your arrows are ribbons, if they were completely straight their width would be consistent. If the ribbon was 1 cm wide it would be 1cm wide the entire length of the ribbon. Now if one end of the ribbon was further away it would appear narrower and as the ribbon moves closer it would widen consistently. If the ribbon bulges/widens suddenly it means the ribbon appears like it's stretching and is wider than the rest of the ribbon.
Is that a more helpful explanation? If not I'll try again and maybe draw up an example.