Even after losing the duel, Glenn lacks all motivation. Yet through his interactions with Sistine and Rumia, he eventually starts genuinely teaching classes that will help them. Meanwhile, suspicious men show up at the academy…
you can shorten it to 
"Thunder sprites, shock."
".بوسعكم أن تختزلوها إلى "يا أرواح الرّعد، صدمة
den Einzelvers „Blitzgeist, sei geschwind!“
machen. Wenn aber daraus der Vierzeiler …
pueden acortarlo
a "duendes de rayos, descarga".
pueden acortarlo
a "duendes de rayos, descarga".
sont capables de l’abréger
en un seul segment…
è in grado di sintetizzarlo in 
"Spiriti del fulmine, folgoratelo!"
é possível encurtar para 
"Espíritos do trovão, choque".
могут сокращать
заклинание до «Духи грома, разите».