depending on context, schnell can be translated as:
quick
quickly
fast
in German the last name "schnell" means fast
Geh schnell = go quickly Quai = quay Guisan is not German
schnell
schnell
Schnell. Sometimes, it's repeated 2 or more times to suggest urgency. (Eg., "Schnell, schnell!")
Geh schnell ~ 'go' as in 'walk' Mach schnell ~ 'go' as in 'do it'
quick - schnell
The same as it means in German (the two languages do overlap to an extant): Hurry up!
Das ist schnell
SCHNELL!
Schnell schnell car-top-fl-copf Lauf, lauf Kartoffelkopf!
You are fast.