How are you supposed to enter the answer here? It wants the past tense verb for leave, but wants just the " さっ" portion as the response, rather than " さった". So, is the intended input here to have to type a double consonant after “sa” on keyboard by typing /xtu/? (I know how to do this on mobile flick, which is easier than remembering this keyboard shortcut to enter just the “っ”).
Simplified: Why are we made to input さっ here and not さった? It’s weird and the first time I’ve encountered this in the system.

