I am a bit stuck on a certain line of a tab, so if someone could help me I would appreciate it.

The tab says:

e---10-(weird downward line thing)---------]
B-------------------------------------------8/10 ]

There's a sort of downwards line going from the e to the b string after 10 which I presume is a slide. But can someone tell me how do i slide if it isn't on the same string?

For further clarification, the tab is the godfather theme tune by Slash, so if anyone is familiar maybe they can help out.
It doesn't really look like a vibrato, its more of a 45 degree line.
Slide down the string and grab the 8 on the b string.
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