Here, being in exile prevents Nabokov from making that knight's move. And you might think about that homophobic attitude to a Proustian past, the fear that it's too like what he wants to do.

因为被放逐的事实，纳博科夫不能,实现迂回前进，大家可能会想到他对,普鲁斯特过去持有的恐同性恋的态度，想到他的恐惧。