Earlier quoted context omitted.
But why to draw hairs between all 'ct' and 'st'? As a non-native speaker, is that some English weirdness that I have yet to learn about?
Ligatures are old fashioned in English but still very common in French. Some ligatures are actually mandatory (like the oe in cœur, heart) while others like st are pretty common in proper typefaces such as those used for novels. The author is probably French (Aurélien).
The stroke just doesn't go in the right direction for those ligatures. My guess is that this font is based on a French (or maybe other latin) script.