That doesn't make any sense, does it? I have 2 thoughts 1) it is not actually a slide, but whatever it is is beyond my comprehension, so you would need to wait for someone who knows more about music than I do, or 2) it's a mistake, but assuming the notes are correct, you could just slide up from the 3rd fret on the E string to get the desired effect (assuming it's written for re-entrant tuning).
The only way that I can make a slide to the fifth fret second string is,
(pluck the 4th string, then,)
either a hammer on at the third sliding to the fifth,
else do a slide up to the fifth on the second string,
but I agree, that tab just looks wrong.
Figured I could do the slide from the 3rd to the 5th on the E but thought it must have been written like this for a reason. Meant to mention the tab is Ken Middleton's "Down By The Sally Garden", from what I can tell he's a pretty careful guy.