Emphasis may give a pronoun enough weight to act as one of the heavier noun phrases that support shifting the NP to after the particle.
In a 2017 Language Log post ("English Verb-Particle Constructions"), Spencer Caplan discusses this very phenomenon. With English verb particles, the order is frequently optional, and Caplan gives two examples:
1a) "John picked up the book"
1b) "John picked the book up"
He then notes an exception (pronouns cannot be thus inverted) and an exception to that exception (unless the pronoun is emphasized via what he calls a focus reading):
1c) "John put it back"
1d) *"John put back it" [by default, usually unacceptable]
[we can infer a focus reading 1e) "John put back it"]
Caplan goes on to discuss what affects a speaker's choice of one order or the other in terms of "acceptability judgments." One factor is "the heaviness of the DP-object,"1 that is, when the main object is particularly complex or emphasized, it tends to follow the particle (1a); another is "whether or not the object had been recently referred to in context," that is, if the object is familiar, it tends to precede the particle (1b).
Pronouns as a matter of function usually refer to something that came before and are relatively light, so they tend to the pattern of 1b and 1c. In fact, grammarians commonly insist that only 1c is correct for pronouns (see, as an example, Virginia Heidinger in Analyzing Syntax and Semantics, 1984). However, these acceptability judgments can shift based on context. If a speaker really wanted to emphasize the pronoun to the point of making it heavier, then a speaker's acceptability judgment would support the shift to 1d or 1e in order to show that emphasis:
John put back it.
Yes, I dashed off it [...]
This kind of emphasis is rare, and I cannot recollect encountering such emphasis for it. That's one reason why ELL instruction tends not to mention the exceptions, as this ELL StackExchange answer demonstrates.
For this answer, I did try to find an extant example using dash off and it, but the Corpus of Contemporary American English didn't have anything (the closest it had was "At least he sat down to dash off something"), and Google Books hasn't turned up useful results.
1If you want to see more examples of "heavy" noun phrases allowing a shift to after the particle, Wikipedia ("Heavy NP Shift") gives a decent account.